One of the biggies these days is term limits.
But in politics, all elected officials have term limits. They are called elections.
When you hear talk hosts, candidates, or other protestors calling for "Term Limits", remember what they REALLY mean is that they can't get the majority of voters to agree with their own choice of candidate, so they want to stack the deck against the will of the majority of voters.
Alan Mollohan, Jay Rockefeller, Robert C. Byrd. All of them are in office and stay in office because a majority of voters like the work they do.
Don't like the guy in office? Convince your fellow voters that the other guy is better.
THAT'S the limit on their term.