Went out canvassing in SmallTown, Wisconsin, again this evening -- and by the way, if everyone who reads TPM would spend an hour or two every day talking to people who *don't* already agree with them, maybe we'd be making even more progress...
There's been a palpable change in undecided voters' attitudes here. When I started canvassing a few weeks ago the people I spoke with were genuinely undecided. I had to really talk to them about the issues, do some gentle persuasion. 
Today every "undecided" was strongly supporting Obama (to the point of asking for yard signs) -- or leaning that way. The other canvassers this evening noticed the same thing.
I also get the sense that these people have made up their minds. They are done thinking about this, and they want an Obama yard sign. Done deal.
There's little McCain can do at this point to make them change their minds. Anything he pulls -- calling Obama a Muslim, dredging up Rev. Wright, whatever -- will just be seen as another stunt.
Voters' opinions are crystallizing right now, and they're leaning toward Obama. Get out and talk to your neighbors! It makes a difference!