You would think somebody as politically astute as Chris Cilliza would point this out: Town halls that are only open to supporters are not real town halls. From his "The Fix" today:
"There's little question that town halls are McCain's best forum. He built his comeback in this campaign around town halls in New Hampshire where he invited attendees to ask whatever was on their minds and largely (and uncharacteristically for a politician) answered the questions asked."
Yeah, McCain went in with a loaded script. It's clear it was an attempted ambush of Obama. What a maverick.