Using the last presidential election as a metric, Kerry by this time in 2004 always had a respectable 6 to sometimes even a 10 point lead over Bush, so the prognosis doesn’t look good (at this point, at least) for the Dems. And yes, we’ve come to the time in the year where state-by-state polls do matter. Face it: McCain has the potential to actually snatch some blue states away from the Dems and if he can squeeze out a victory in Ohio, MI, or PA then the fat lady has sung. All the crackheads in Detroit won’t be able to save Obambi in the Wolverine State come November.
I think you might want to wait until the Democrats have a nominee before saying this - Kerry had already won the nomination at this point.