Obama seems to be polling to high IMHO.
Research 2000's weighting is 35% Democrat; 26% Republican; 30% Independent; 9% Other/Refused
However, using Rasmussen's weighting for this past week, Democrat 39.0%, Republican 33.6%; Unaffiliated 27.40% and applying it here, I get:
Obama: Democrat (88%) 34.320, Republican (7%) 2.252, Unaffiliated (50%) 13.70 = 50.372% (50% rounded)
McCain: Democrat (7%) 3.120, Republican (84%) 28.224, Unaffiliated (38%) 10.412 = 41.756% (42% rounded)
That's an Obama lead of 8% rounded
Dave