[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/06/03/art.obamamccain.gi.jpg caption="Obama is leading McCain in swing states in a new poll."]
(CNN) – Barack Obama leading 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 points - but a Quinnipiac University poll released Wednesday shows him leading McCain by 12 points, 52-40. In Ohio — a state Obama lost to Hillary Clinton by 10 points in March — he’s leading McCain 48-42. And in Florida, where he did not campaign this primary season and lost an unsanctioned Democratic contest, he leads McCain 47-43.
The Ohio and Florida results are reversals from Quinnipiac polls published a month ago, when Clinton was still in the race, and McCain led Obama in hypothetical match-ups.
In the waning days of her campaign, Hillary Clinton argued to voters and superdelegates that she should be the nominee because she was the stronger candidate to beat McCain in these swing states. Democrats in all three swing states say they’d like to see her on the ballot this fall, but independent voters give the idea a thumbs down by margins of 9-16 percent.
Florida clinched the presidency for George W. Bush in 2000, and Ohio did the same in 2004.
Quinnipiac surveyed between 1,300 and 1,500 voters in each state from June 9-16 with margins of error of plus or minus 2.5 percent for Pennsylvania and 2.6 percent for Ohio and Florida.