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While nationally the two rivals are locked in a dead heat, in 12 expected battleground states — Colorado, Florida, Iowa, Michigan, Nevada, New Hampshire, New Mexico, North Carolina, Ohio, Pennsylvania, Virginia, and Wisconsin — Obama leads by eight points in the survey.

President Obama, Republican challenger Mitt Romney, and their allies have already spent $87 million on TV ads, the Associated Press reports -- most of it in nine battleground states. They are, not surprisingly, nine toss-up states that will likely decide the election: Florida, Ohio, Virginia, North Carolina, Iowa, Pennsylvania, Colorado, Nevada and New Hampshire.