One of the most consistently liberal voices in Congress will not be returning in 2013. Massachusetts Democrat Barney Frank announced on Monday that he will not seek re-election. Redistricting left Frank facing a tough re-election campaign.
Source: http://www.npr.org/2011/11/29/142880389/rep-barney-frank-faced-a-tough-re-election-bid?ft=1&f=1014
Tom Harkin Harry Reid Patrick Leahy Lamar Alexander Barbara Boxer Ben Nelson