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Indiana State Treasurer Richard Mourdock announces that he will be candidate for the U.S. Senate in the 2012 Republican primary during a campaign rally in Indianapolis, Tuesday, Feb. 22, 2011. (AP Photo/Tom Strattman)

Indiana State Treasurer Richard Mourdock announces that he will be candidate for the U.S. Senate in the 2012 Republican primary during a campaign rally in Indianapolis, Tuesday, Feb. 22, 2011.

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.