Plot: Actor Zach Galifianakis hosts; Vampire Weekend performs "Cousins" and "Giving Up the Gun. " Sketches include "Health Care Reform," "The Vogelchecks," "Bidet," "Zach Drops by the Set," "Today," "Weekend Update" with guests Mo'Nique and Will Forte, "What Up with That?" "The Situation Room," and "Pageant Talk