Hotly contested primaries are taking place on Tuesday in New York, Colorado, Utah, and South Carolina, making it one of the most dramatic down-ballot primary nights of the 2024 election cycle. With all House seats up for re-election and 34 Senate seats on the ballot, House Republicans and Senate Democrats are at risk of losing their slim majorities in November.

One race to watch closely is the race for Colorado's 8th district, where former talk show host Jeff Crank is giving a tough challenge to state GOP party chair Dave Williams, who is the preferred candidate of former President Donald Trump. Trump's reputation for endorsing primary winners appears to be on the line in this district.

According to the Cook Political Report, a total of 22 House districts are rated as toss-ups, meaning that the outcome is highly unpredictable. Furthermore, 193 House districts are considered solidly Republican, while 173 are solidly Democrat. In the Senate, Democrats have 23 seats on the ballot, including three toss-ups. Additionally, retiring Senator Joe Manchin's seat in Pennsylvania is expected to be flipped by Republicans.

On the other hand, the GOP has 11 Senate seats on the ballot, all of which are likely or solidly Republican. These numbers suggest that both parties have much at stake in the upcoming primary races.

As voters head to the polls in these key states, the outcome of these primaries will set the stage for the general election in November. With the possibility of major shifts in Congress, both Republicans and Democrats have a lot on the line as they strive to maintain their majorities and secure the power to shape legislation in the coming years.