National polls had a Republican bias but State polls (with the exception of Rassy and other joke pollsters) were relatively accurate. This is another important lesson: State polls are historically better than national polls to predict the outcome of the election.
I think you're right, but the main inaccuracy in the national polls was the overly-restrictive likely voter screen. If it wasn't for that, Gallup would've basically nailed the national vote margin. It's not so much that the national polls had a Republican bias per se, but rather that the likely voter polls screened out a lot of Obama voters.
