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A yard signs calling for voters to "retire" Sen. Richard Lugar stands along the road in New Palestine, Ind., Friday, March 30, 2012. Lugar, running for his seventh term in the U.S. Senate, is facing one of his toughest election battles in the Republican primary against state Treasurer Richard Mourdock. Lugar will switch his voter registration to his family farm in resolving a dispute with local election officials who ruled that he couldn't vote using the address of an Indianapolis home he sold in 1977. (AP Photo/Michael Conroy)

Indiana Sen. Richard Lugar loses seat

Richard Lugar, the longest-serving Republican in the Senate, was defeated May 8 as Indiana Republicans chose state Treasurer Richard Mourdock over Lugar as the party's nominee.