We already know that Barack Obama is capable of carrying a tune, so last night's performance at Blues Night at the White House didn't come as much of surprise. And yet, the president played "shy," an act no one believes. "President Obama appeared hesitant to sing publicly for the second time in 2012 at a White House event Tuesday night," reported The Washington Post's Natalie Jennings. That hesitancy gave way to belting, as Obama sang a few bars of "Sweet Home Chicago," briefly stealing the show from the likes of B.B. King, Buddy Guy and Mick Jagger.