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Figures compiled by political analyst Rhodes Cook and released last week show that of 33 U.S. senators elected last November, Dean Heller of Nevada won with the smallest margin.

The latest issue of the Rhodes Cook Letter reports that the range of vote percentages gathered among the 23 Democrats, two independents, and eight Republicans elected runs from the 75.7 percent of the vote collected by Wyoming Republican John Barrasso to Heller's 45.9. No other senator finished lower than Heller, though, like Heller, some of them had multiple opponents to drain off votes.

Heller faced Democrat Shelley Berkley, Independent American David Vanderbeek, and the “None of these candidates” ballot option.

Cook also notes Nevada was the only state to elect a GOP senator while voting for Barack Obama.