The always insightful Michael Barone, of U.S. News & World Report, has a couple of interesting entries in his blog, here and here. Warning, these are only recommended for total political junkies who love state-by-state analyses of electoral college votes available, and of the youth and seniors votes.
Barone's bottom line...he sees some factors at least mildly favorable to McCain and mildly unfavorable to Obama. One of these is the study I referenced below in my Millennials Losing Motivation post.