Most of the time, redistricting changes where a district is. But it can also change when incumbents must stand for re-election.
This is most commonly the case in state senates, where senators often serve varying term lengths or staggered terms, meaning only a certain number of districts are up for election each cycle.
Senators in 30 states serve four-year terms. In 12 states, senators serve two-year terms. But in eight states, senators serve two- or four-year terms depending on how close the elections are to redistricting. Howthese states change the timing and term lengths in their state Senates vary.
