I get my poll results from all over the place, but one of the most useful sources is the
Polling Report. It has a public side to it (most of you have already found it), but the wealth is in the state-by-state information, and that's subscriber only. The polls I run on this site are but a sliver of what those guys have available online.
All this to say -- I don't source those guys enough of the time, and I should. And if polls are your reason for living (you know who you are), consider getting a subscription and supporting their work.
No online signups yet, but I've heard it's in the works.