Palin just delivered exactly the same identity-based attacks that McCain and Republicans have been using all summer against Obama. Those attacks only resulted in Obama's favorables rising, and were ineffective. The idea with Palin seems to be that if those attacks are delivered by someone with a different demographic profile, maybe they will work this time.
I doubt it. Palin was the best speaker they had in terms of style, but I don't think the problem with the attacks is that they wanted for style or demographic posturing.
What do you see tonight? After watching two nights of this stuff, I had forgotten about how Republicans saw themselves as just a bunch of purely good people who are opposed by a shadowy, sneering liberal minority. That even actually seems to be their entire platform, as everything they propose somehow stems from that belief.