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., on Oct. 23, 2012. (Associated Press)

Photo by: Michael Conroy

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., on Oct. 23, 2012. (Associated Press)