Sen. Claire McCaskill, Missouri Democrat, who won her seat narrowly in 2006 and is up for re-election in 2012, has no shortage of would-be GOP challengers. (Associated Press)
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Sen. Claire McCaskill, Missouri Democrat, who won her seat narrowly in 2006 and is up for re-election in 2012, has no shortage of would-be GOP challengers. (Associated Press)
