Being accused & being convicted are two different things. People accused George Zimmerman of murder.
This sign language idiot has probably been accused of assaulting cops, pregnant women, etc... He's being framed for everything, it's pretty commonplace.
All kidding aside 333386, seriously, I'm actually shocked they let this guy get so close to Obama without vetting him and knowing his background. My guess would be, if you're once accused of any serious crime, they don't let you get within a city block of him, much less on stage.