Pollster.com's Mark Blumenthal explains how pollsters account for likely voters here. He explains the difficulties of counting cell phone only households here.
FiveThirtyEight.com's Nate Silver breaks down the quirks of different tracking polls here. He attacks traditional likely voter models here.
Emory University political scientist Alan Abramowitz suggests that much day to day movement is noise.
Think you've got this election all figured out? Put your money where your mouth is on the Iowa Electronic Markets.
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