Ohio was D+8 (39-31-30) in 2008 exit polls when Obama won by 4 and R+5 in 2004 (35-40-25) when Bush won by 3.
This leads to believe the voters of Ohio are liars.
As PPP points out, McCain led Obama 49-41 at the same time in 08, though I doubt Obama's favorables were that low.
And by the way the nomination fight didn't cost Obama Ohio, and he didn't even win it's primary.
A look at our database shows McCain consistently led Obama in Ohio until the September economic collapse.
A double dip is the only GOP hope.