US Congress Explained: Key Edexcel Politics Notes

The Structure of Congress

Think of Congress as a bicameral system - essentially two separate chambers working together (and sometimes against each other). The House of Representatives represents population sizes, so bigger states get more seats, while the Senate gives every state exactly two senators regardless of size.

Originally, the House was meant to reflect popular sovereignty (power coming directly from the people), while the Senate acted as a check against pure democracy. The 17th Amendment in 1913 changed everything by making senators directly elected rather than appointed by state governments, largely because industrial monopolies were buying off state legislators.

Unlike the UK Parliament, you can't really call one chamber "upper" or "lower" - they're more like equal partners with different specialties. The House controls spending bills, the Senate handles treaties and appointments, but both share the crucial power to make laws.

Key insight: Equal pay for both chambers shows they're considered equally important - the Founding Fathers knew what they were doing when they balanced these powers.

Membership of Congress

Congress has grown massively since 1787 - from just 26 senators and 65 House members to today's 100 senators and 435 House representatives. It's like watching a small committee turn into a massive organisation as America expanded.

The House of Representatives gets completely re-elected every two years, with each state's delegation based on population. Six states are so small they only get one representative! Meanwhile, the Senate operates on six-year terms split into three "classes" - only one-third face election every two years.

Congressional districts get redrawn every decade after the census, which creates opportunities for the party in power to manipulate boundaries. Each senator represents their entire state, while House members only represent their specific district.

Reality check: There's no limit on how many terms you can serve in either chamber - some members have been there for decades, which explains why experience (and name recognition) matter so much.

The leadership structure differs between chambers, with the House having a Speaker as its most powerful figure, while the Senate is technically led by the Vice President (though they rarely show up).

The Election Cycle

Every two years, American voters get to shake things up with congressional elections - and trust me, they often do. When these happen alongside presidential elections, they're just called elections, but when they occur halfway through a president's term, they're the infamous midterm elections.

Midterm elections often serve as a brutal report card on the president's performance. Presidents frequently lose control of one or both chambers because voters want to send a message, and separation of powers means they can't always deliver on campaign promises quickly enough.

Incumbency gives sitting members huge advantages that are honestly quite unfair to challengers. In 2020, congressional races cost a staggering **$7 billion**, but incumbents like **Mitch McConnell** only spent$34 per vote while his challenger spent $92 per vote - name recognition is everything.

Money matters: Even with nearly $65 million spent on his campaign, McConnell still spent less overall and per vote than his opponent who burned through over$90 million.

Franking privileges let members mail constituents for free (officially not for campaigning, but let's be realistic), and requests mysteriously spike during election years - from 651 in January 2020 to 1,529 by April.

Gerrymandering and Incumbency Advantages

Here's where things get properly dodgy - congressional districts for the House get redrawn every decade by whoever controls each state's legislature. This creates the perfect opportunity for gerrymandering, where the ruling party draws boundaries to give themselves unfair electoral advantages.

The result? Relatively few swing seats and incumbent members who are practically guaranteed re-election. It's like playing a rigged game where the house always wins, except in this case, the House of Representatives really does always win.

Incumbents enjoy massive built-in advantages beyond just money. They get official websites to showcase their work, direct communication channels with constituents, and that all-important name recognition that makes voters feel comfortable choosing the familiar option.

The numbers don't lie: Congressional re-election rates are incredibly high, and gerrymandering is a major reason why - safe seats mean predictable outcomes.

This system helps explain why Congress can seem so resistant to change and why the same faces keep appearing year after year. When districts are drawn to favour one party, general elections become less competitive than the primary elections within each party.

Senate Elections and Divided Government

Senate elections work on a clever rotation system - every senator belongs to Class I, II, or III based on when their six-year term expires. This means only one-third of Senate seats are up for grabs every two years, but that's still enough to flip control of the entire chamber.

The election cycle creates fascinating political dynamics. Between 1901 and 1969, the US federal government was only divided 21% of the time - but since 1969, it's been divided a whopping 70% of the time! This isn't coincidence; it reflects how voters increasingly split their tickets.

Divided government has become the norm rather than the exception. Of the last six elections, five resulted in divided federal government, with only Obama's first Congress enjoying Democratic control of both chambers.

Political reality: Modern voters seem to prefer checks and balances, deliberately splitting power between parties rather than giving one party complete control.

When different parties control different parts of government, it creates natural tension and forces compromise - though it can also lead to gridlock when neither side wants to give ground.

Distribution of Powers

Article I gives Congress some seriously impressive powers, split between what both chambers can do together (concurrent powers) and what each can do alone (exclusive powers). Don't let anyone tell you the Senate is automatically more powerful - the House has some absolute bangers.

The most crucial concurrent power is creating legislation - both chambers must agree before any bill becomes law. They can also override presidential vetoes with a two-thirds majority, which explains why all but one of Bush's 12 vetoes came after he lost congressional control.

Implied powers come from the necessary and proper clause and commerce clause, letting Congress expand beyond just the enumerated powers. This flexibility has allowed Congress to grow its influence massively since 1787.

Power plays: Biden's "Build Back Better" plan shows how Congress can make or break presidential agendas - only one part passed quickly while the others got stuck in legislative battles.

Congress can propose constitutional amendments with a two-thirds vote in both chambers (last done successfully in 1992) and technically has the power to declare war (last used against Romania in 1942, believe it or not).

Congressional Investigations and Emergency Powers

Congress flexes serious muscle through its investigation powers, which aren't explicitly mentioned in the Constitution but have become absolutely crucial. They can subpoena witnesses - meaning you have to show up whether you like it or not - and dig into anything from Hurricane Katrina responses to the January 6th insurrection.

The 25th Amendment gives Congress the power to confirm a new vice president if that office becomes vacant. This happened when Nixon resigned in 1974 and after JFK's assassination in 1963 - it's rarer than you'd think but incredibly important when needed.

Modern warfare has made the declaration of war power somewhat outdated (seriously, 1942 was the last time), but Congress still uses its power of the purse to control presidential military adventures. Can't fight wars without funding, after all.

Investigation nation: Recent congressional investigations have covered everything from Russian election interference (four different committees in 2017!) to the Capitol riots - showing how this power shapes political accountability.

These powers show how Congress adapts to modern challenges while maintaining its constitutional role as a check on executive power.

Exclusive Powers of the House of Representatives

The House of Representatives holds the ultimate trump card - the power of the purse. Every spending bill must start there, giving them massive leverage over presidents and policies. When Trump wanted to slash the EPA budget by a third in 2018, House Republicans (from his own party!) only agreed to a 6% cut.

Impeachment charges can only originate in the House, making them the constitutional equivalent of a grand jury. Used only four times in US history, it's still a powerful threat that keeps presidents awake at night - just ask Trump, who got impeached twice.

If the Electoral College produces no winner (needing 270 out of 538 votes), the House chooses the president with each state getting one vote regardless of size. Wyoming gets the same say as California - talk about unexpected power shifts!

Reality check: While the Senate can modify spending bills, starting them gives the House enormous agenda-setting power that shapes national priorities.

The impeachment power isn't about criminal law - it's purely about removing someone from office. As Gerald Ford once said, "an impeachable offense is whatever a majority of the House considers it to be at a given moment in history."

Exclusive Powers of the Senate

The Senate's confirmation power turns every major presidential appointment into a political battleground. Just look at Trump's Supreme Court nominees - Brett Kavanaugh faced unprecedented protests over sexual assault allegations, while Democrats boycotted Amy Coney Barrett's committee vote entirely.

Treaty ratification requires a two-thirds Senate vote, giving them serious foreign policy clout. In 2012, they rejected the UN Convention on the Rights of Persons with Disabilities because Republicans worried about extra government regulation - showing how domestic politics shapes international commitments.

The confirmation process has become increasingly theatrical, with senators using hearings for political grandstanding. During Ketanji Brown Jackson's hearings, Republicans grilled her on judicial philosophy while Democrats like Cory Booker praised the historic nature of nominating the first Black woman to the Supreme Court.

Political theatre: Supreme Court confirmation hearings have become must-see TV, revealing as much about senators' presidential ambitions as the nominees' qualifications.

These powers make individual senators incredibly influential - a small group can block treaties or nominations, giving even minority parties significant leverage in the legislative process.

Senate Trial Powers and Electoral Backup

When the House impeaches someone, the Senate becomes a courtroom with a twist - they need a two-thirds majority to convict and remove from office. The House acts as prosecutors while the accused can mount a full defence with witnesses and arguments.

The Constitution's vagueness about impeachment grounds creates political drama every time. Gerald Ford's famous quote that "an impeachable offense is whatever a majority of the House considers it to be" shows how subjective this process really is - it's politics, not criminal law.

If the Electoral College deadlocks on the vice presidency (separate from the presidential vote), the Senate picks the VP. This makes sense since the vice president serves as president of the Senate, so they're essentially choosing their own leader.

Historical rarity: Electoral College deadlocks have only happened twice (1800 and 1824), but with increasing political polarisation, it could become relevant again.

Impeachment trials aren't about sending anyone to prison - they're purely about keeping or losing your job. Criminal charges can follow separately, but the Senate trial only determines whether you stay in office or get booted out.

The Senate's role as the "trial chamber" gives individual senators enormous responsibility in what are essentially political decisions dressed up as legal proceedings.