McConnell, left, and House Minority Leader John Boehner at the Capitol in March. Chip Somodevilla/Getty Images North America hide caption

itoggle caption Chip Somodevilla/Getty Images North America

Sen. Arlen Specter (D-PA) pauses as he gives his concession speech to supporters on Tuesday in Philadelphia. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP