Sen. Richard Lugar loses primary to Richard Mourdock 08 May 2012 Sen. Richard Lugar (R-Ind.) lost his primary on Tuesday, becoming the latest Republican to fall victim to a tea party-fueled opponent. Results early Tuesday night showed state Treasurer Richard Mourdock leading the six-term senator 61 percent to 39 percent with 40 percent of precincts reporting. The Associated Press has called the race for Mourdock. His nomination also opens the door a crack to Rep. Joe Donnelly, a Democrat whose chances improve now that he doesn't have to face the more moderate longtime incumbent.