'Hangover 2' Stars Talk Mel Gibson's Canceled Cameo; Robert Downey Jr. Defends Star

Director Todd Phillips and Zach Galifianakis chat with Access at the "Due Date" junket about why Mel Gibson's cameo in "The Hangover 2" was canceled. Is it true that Zach was the driving force behind Mel's role being axed? Plus, Robert Downey Jr. defends... more