Party splits:
Democrats (38%): 88/8 Obama
Republicans (36%): 90/7 McCain
Independents (26%): 48/48 tie
It should be noted that in 2004, the partisan split was around 36R/35D/29I. So the idea of Republicans having the same percentage in low-enthusiasm 2008 as in high-enthusiasm 2004 is a bit hard to believe right now.