Check out this bit of video captured Sunday night at the Kennedy Center by our very own Betsy Rothstein. Not hearing what anyone was saying to each other in the VIP box, here's what you see: As the Obamas get into the groove of the gospel choir, Joe BidenJoe BidenTop union offers backing for Ellison in DNC race John Kerry to teach at Yale on global issues Ellison needles Perez for 'unverifiable' claim of DNC support MORE gives up trying to keep rhythm and turns around, making a couple steps toward walking out. Obama stops him and turns him back around, where Biden again proceeds to try to keep rhythm: