The folks in matching tee-shirts are, in fact SEIU members.
Here's a screen cap from the video:
And here's a July, 2008 photo from a prescient post by NH blogger, GraniteGrok, showing another SEIU member campaigning for BO:
So, Nancy Pelosi, Rahm Emanuel, Barbara Boxer, Harry Reid, and that little doughy-faced Obama press spokesman can whine all they want about the vast right wing conspiracy "astroturfing" town hall meetings.
The pictures prove them liars and hypocrites.
Wow, you need to tell Glenn Beck. He would love to know the SEIU members are out counter-protesting the real grassroots folks in their matching union t-shirts.