In late August, a poll by Mason-Dixon showed Missouri Democratic senator Claire McCaskill leading her Republican challenger Todd Akin 50 percent to 41 percent. But McCaskill's 9-point lead has shrunk to a 2-point lead, according to Mason-Dixon's most recent poll:

The News 4, St. Louis Post-Dispatch and Kansas City Star poll shows Senator Claire McCaskill with a 2 percent lead over Congressman Todd Akin, at 45 and 43 percent, respectively.

The RCP average of polls shows McCaskill leading Akin by 4.2 points.

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