John Olver (D), a 75-year-old congressman from Massachusetts, has announced he won't seek reelection.
His decision follows news that the state will lose one of its 10 congressional districts in 2012 due to redistricting.
As the Boston Globe's Glen Johnson pointed out, the 75-year-old's retirement prevents a showdown between elected officials.
"[Olver's] far-western district had faced combination with one of two nearby districts," he said in a tweet.
The National Journal reports family issues may have also influenced the longtime congressman's decision. In late March, his wife was diagnosed with ovarian cancer.