A major turnover is coming in the 119th Congress, which will meet from January 2025-January 2027.
Already, eight Senators and 43 House members are not running for reelection, and turnover by defeat is likely in many other cases.
Among the US Senators who are retiring are the following:
Mitt Romney of Utah
Kyrsten Sinema of Arizona
Joe Manchin of West Virginia
Ben Cardin of Maryland
Debbie Stabenow of Michigan
Tom Carper of Delaware
At least 11 Democrats and 14 Republicans are leaving the House of Representatives.
Additionally, a few well known individuals ran for the Senate and have been eliminated, specifically Katie Porter and Barbara Lee in California, while Adam Schiff is on the way to likely Senate membership after ending up first in the California Senate primary.
Dean Phillips of Minnesota chose to challenge Joe Biden in a lost cause, and is leaving the House as a result.
Elissa Slotkin in Michigan; Alex Mooney in West Virginia; Colin Allred in Texas; Andy Kim in New Jersey; and Ruben Gallego in Arizona are among those leaving the House of Representatives to run for the US Senate seats in their states.
A lot more turnover is likely, as many other incumbents face the possibility of defeat this November.
Rep. Mike Gallagher to leave Congress in April, giving GOP an even narrower majority .
https://www.cnn.com/2024/03/22/politics/mike-gallagher-republican-retiring/index.html
Marjorie Taylor Greene has filed a motion to oust Speaker Johnson amid anger about the government funding bill from the House Republican Conference’s right flank.
https://www.cnn.com/2024/03/22/politics/marjorie-taylor-greene-mike-johnson