Candidates for Indiana's U.S. Senate seat Democrat Joe Donnelly, left, Libertarian Andrew 

Candidates for Indiana's U.S. Senate seat Democrat Joe Donnelly, left, Libertarian Andrew Horning, center, and Republican Richard Mourdock participate in a debate in New Albany, Ind., Tuesday, Oct. 23, 2012. (AP Photo/Michael Conroy)
Associated Press
Candidates for Indiana's U.S. Senate seat Democrat Joe Donnelly, left, Libertarian Andrew Horning, center, and Republican Richard Mourdock participate in a debate in New Albany, Ind., Tuesday, Oct. 23, 2012. (AP Photo/Michael Conroy)
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