It’s official: Michelle Obama has mad dance-floor game. The first lady dropped by "Late Night With Jimmy Fallon" Friday to promote her “Let’s Move” campaign, and she starred with Jimmy in a segment documenting the evolution of mom dancing. There was just one problem: The premise of the sketch was that moms can’t dance very well, but the first lady was still good. She had to demonstrate an out-of-sync electric slide for comic effect … but she couldn’t!