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Mike Lee is one of the most conservative members of the Senate. The freshman Utah Republican was elected with strong Tea Party backing and, like Sen. John Thune of South Dakota, he's a man of the West.

Mention the possibility that Thune, 51, might team up with Republican presidential candidate Mitt Romney, and Lee's eyes light up: "I love John," he says. "He's articulate, passionate, collegial. I mean ... I think he'd be great."