For two consecutive elections, more Republicans than Democrats decided against running for reelection, and so far, 2022 is shaping up similarly. Five Republican senators and one congressman have already announced they won’t seek office again next year, compared with just one Democratic congresswoman, and their retirements could signal a change within the GOP. “You typically see higher retirements when there is some sort of party shift,” said Joshua Huder, a senior fellow at Georgetown’s Government Affairs Institute. Major party shifts in Congress can also be the result of a wave election that brings in new blood, or a large, older...