I think Democrats are overpolled, but I don't think it's intentional efforts to make Obama look good.
I have always considered you to be a very rational and smart guy, so why are you buying into this? Please understand that except for Rasmussen, nobody else weighs by party ID. So they couldn't be overpolling Democrats (unless you think they have a flawed methodology leading them to contact more Democrats). In addition, in most of the polls they ask whether you consider yourself to be a Democrat or Republican, not what their registration is. Party ID is fluid. People who were apprehensive about the economy and were undecided or voting for Romney might have been identifying as Independents back during summer. After the Mitt gaffes, or perhaps the DNC, they might be willing to give Obama the benefit of the doubt and now could be identifying as a Democrat. Similarly someone who might have been identifying as a Republican in the summer might be identifying as an Independent now due to some of the Mitt gaffes. Party ID is not an unchanging demographic characteristic like race, gender or age, it is very fluid. Even more fluid than party registration.
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