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Smartest U.S. Senators (PHOTOS)

Love it or hate it, the United States Senate is home to some of the smartest (and most highly educated) legislators in the country -- at least judging by their varied resumes.

But what makes a smart senator? Earning a Rhodes scholarship? Teaching at universities and writing books? Graduating with honors (from all three schools, no less)? All of the above.

Here are some of the smartest senators serving on Capitol Hill today.