>To take this a step further, Zogby (the only pollster to get the last presidential election right) polls people likely to vote. I noticed CNN is starting to do this as well. By polling likely voters, you're dealing with people who can have a difference in the outcome. By the by, Zogby's polls typically show a more conservative result than the others.

Yes, I've noticed, and it makes a lot of sense; they just have to be careful about how they screen "likely voters," and then they'll need a much larger sample of respondents to achieve the same +- 3% accuracy, since they have to throw out all the unlikely voters. It's not very important what those who stay home on election day think with respect to politically-related issues, is it?