The 15-term congressman survived a crowded 2010 primary with less than 30 percent of the vote and would face a tough 2012 race after redistricting overhauled his district. Burton faced primary challenges from former congressman David McIntosh, 2008 and 2010 opponent John McGoff and former U.S. attorney Susan Brooks, among others.
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Burton is the seventh U.S. House Republican to announce he won't seek reelection this year. Seven other Republican House members are running for higher office.

On the Democratic side, 11 House members are retiring, and eight are running for another office.