Columbia University professors Robert S. Erikson and Karl Sigman wrote an analysis of the big SurveyUSA state-by-state polls for the Pollster blog and tried to figure out what might happen in the general.
… Our simulations yield a 88% chance of Obama beating McCain (with 306 Electoral College votes on average versus 233 for McCain), and a 74% chance of Hillary beating McCain (with 285 Electoral College votes on average versus 253 for McCain). About one percent of our simulated outcomes were Electoral College ties. (We ignored within-state variation in Maine and Nebraska, which divide their electoral votes by district.)
Warning: The rest of this article is about as mind-numbingly boring as humanly possible.