Rep. Dan Boren (D-OK) has announced that he won't seek re-election. Shira Toeplitz of Roll Call reports:

Boren, 37, will retire instead of seeking a fifth term, according to a source close to the Congressman - marking the first House Member this cycle to announce he is leaving at the end of this Congress without running for another office. The Oklahoman first reported Boren's retirement, which he will announce at 3 p.m. EST in his hometown of Muskogee.

Boren won 57% in 2010, McCain won 66% in 2008. Boren, the son of the popular former Governor David Boren, now President of the University of Oklahoma, was one of the few Democrats to win in what may be the most GOP-friendly state in the country.