The U.S. Senate’s top Republican called on his party to unite behind leading presidential candidate Mitt Romney on Sunday as rival Rick Santorum vowed to stay in the race beyond a likely defeat in Tuesday’s Wisconsin primary.

Senate Republican Leader Mitch McConnell stopped short of endorsing Romney in an interview on CNN’s “State of the Union” show. But McConnell did say the former Massachusetts governor would make an “excellent nominee” and left little doubt about whom he supported in the battle to take on Democratic President Barack Obama in the November 6 election.

“It’s time to turn our attention to the fall campaign and make the case against the president of the United States. “It’s important to get behind the person who is obviously going to be our nominee,” McConnell said, referring to Romney.

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