Can our nation afford political waffling on issues of scientific consensus? Stan Honda/AFP/Getty Images hide caption

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Former President Clinton has campaigned on behalf of Rep. Kendrick Meek, the Democratic candidate for Senate in Florida.  John Raoux/AP hide caption

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Florida U.S. Senate candidates Marco Rubio (from left), Charlie Crist and Kendrick Meek share a laugh before their debate Wednesday. Joe Burbank, Pool/AP hide caption

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