David Letterman welcomed MSNBC host Rachel Maddow to The Late Show last night and told the liberal pundit that he thinks her cable news competitor Bill O'Reilly is too smart to really believe the stuff he opines about and that he'd probably be a weatherman if he wasn't hosting a show at Fox News. After Dr. Maddow politely disagreed, the two bespeckled talk show titans traded glasses! Up next, Jon Stewart makes a pass at Will Ferrell on The Daily Show and Stephen Colbert tells author Laura Ingraham that she is a terrible, racist writer on The Colbert Report. Last but not least, Betty White reveals exactly what kind of drunk she is on The Tonight Show with Jay Leno. Watch our compilation to see what you missed.