Comedian Louis C.K. electrifies the Kennedy Center crowd

Jason Mraz and Jennifer Hudson. Check. Sufjan Stevens and Shania Twain. Sure. Green Day frontman Billie Joe Armstrong? Yep, throw him in, too. I've seen a high-end parade of pop stars perform at the Kennedy Center over the past decade, but I've never seen anyone get quite the raucous rock-star reception inside Foggy Bottom's marble box as that of 45-year-old stand-up comic turned cable-TV king Louis C.K..