Bill Nelson, U.S. senator (Last year: 10th). 2012 is a big year for Florida's senior U.S. senator. The Orlando Democrat is facing re-election at a time when incumbents are about as popular as navel lint. But the field of GOP challengers is struggling to gain traction. And, as a moderate Dem who's been in public office for decades, Nelson is a formidable political force.
JOE BURBANK, ORLANDO SENTINEL
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