I've been a big fan of videos from Sharp Elbows. He has the knack for confronting people on camera in a way that is tough, but never over the line. He is honest, polite and tenacious.
So, at the 9/12 rally in St. Louis on Sunday, he had his reliable eye out for invaders, instigators and impostors. He's posted a series of videos under the title "Calling out the fakes." Call away: