More than three dozen members of Congress have already said they are planning to leave their seats, setting the stage for major turnover in the 2024 election.

Few of the departures that have been announced are expected to alter the balance of power in the closely divided House, where the vast majority of seats are gerrymandered to be safe for one of the two political parties, or in the Senate. But a handful are already putting crucial seats up for grabs.

Many of those who are leaving are expressing frustration about the polarization and paralysis that has gripped the institution particularly this year, as House Republicans, dominated by their far-right flank, have struggled to do the basic business of governing and feuded over who should lead them.

Here’s a look at the retirements that have been announced so far. A bolded name indicates a departure that could alter the balance of power in Congress, or lead to a competitive or potentially competitive race.