Disclaimer, I'm an Obama supporter, but the point I'm about to make here on how to aggregate polls is not, to my knowledge, beneficial to one candidate over the other.
Jerome makes a point to talk about how his EV calculators rely on the most recent polls for each state. I've got a couple of quick graphs on the flip that will demonstrate how this isn't a very reliable way of looking at state-level support.
First, remember how the benefits are calculated. Social Security basically looks at our lifetime Social Security contributions, adjusts it for average wage growth, and constructs a monthly benefit for us. That's vastly simplified, but good enough for the purposes of this discussion.

Electoral-vote currently reports them by the day the poll was released, which doesn't show a clear picture of how the nation is feeling every day since the poll dates are scrambled.
But, when I went through each of the last sixty days and counted up the EVs by how the polls were being answered each of those days, averaging multiple polls per state if necessary, I came up with the following graph:
· WI-08: Wingnut plans to run as "conservative independent" (desmoinesdem)
· 50 percent of southerners say Obama better president than Bush (desmoinesdem)
· What Yesterday Says About Young Voters (Mike Connery)
· Max Blumenthal on the dysfunctional movement driving the GOP (Mike Connery)
· IA-Gov: Culver launches second tv ad (desmoinesdem)
· Hilarious Vid On Why We Must Vote No On Issue 2!! (Cliff Schecter)
· NY-23: Scozzafava Drops Out! (lipris)
· NY-23: Pataki Goes Rogue, Endorses Teabagger Darling Doug Hoffman (lipris)
· Dunne Considering Run For VT-Gov (Nathan Empsall)
· McGovern Grandson Looks to Challenge Thune in 2010 (Jonathan Singer)
· IA-03: Two potential challengers for Boswell (desmoinesdem)
· NJ-Gov: Daggett Goes After Christie and Corzine (Jonathan Singer)