The story

Sen. Barack Obama is leading Sen. John McCain in the crucial swing states of Ohio, Pennsylvania and Florida, according to a new survey.

Obama lost the Democratic primary in Pennsylvania by 9 percentage points. But a Quinnipiac University poll released Wednesday shows him leading McCain by 12 points, 52 to 40 percent.

In Ohio, a state Obama lost to Sen. Hillary Clinton by 10 points in March, he's leading McCain 48 to 42 percent. Read full article »

CNN senior political analyst Bill Schneider and political producers Ed Hornick and Alexander Marquardt contributed to this report.

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