David Letterman continued to hammer John McCain last night, taking obvious glee in the fact that he has finally found an adversary worthy of supplanting former bête noires like Les Moonves and the entirety of NBC Broadcasting. If you'll remember, McCain incurred Letterman's wrath by canceling a Late Show appearance under the guise of heading immediately to Washington D.C. — something Letterman debunked by cutting to a live feed of McCain's interview with Katie Couric just down the street. Last night, after taking shots at McCain in his monologue ("He loves bailouts — he bailed out on me"), Letterman welcomed guest Julia Louis-Dreyfus, who promptly swore her allegiance to the Late Show host, then demonstrated it with another live feed cut to a lonely Katie Couric. Clip above. [CBS]