[HenryArmitage]

Silver is betting his bias along with the Lib pollsters he swallows that borders on delusional like the rest of the clowns at DU.
For an example. Poll after poll including PPP and PMSNBC polls show very large margins..
I agree for the most part. The idea is using the past to predict the future. If the PPP and PMSNBC are way off on their results they will suffer a less predictive weighting next year. As you pointed out the trouble with using historical turnout/results is each year has its own unique turnout/results and it is near impossible to factor in such intangible things as storms, economy etc. etc.. There is an excellant article at RedState that discusses just those short comings. Here if you are interested (should pop)

[Red Steel]

Just in case you haven't seen, more bad news for Obama and Silver.

Pew: Yup, Romney's Leading in Early Voting [Confirms Gallup]