Sen. Mary Landrieu threatened the president of the United States with physical violence on Sunday, saying that if he or any other government official criticizes New Orleans police for failing to keep civil order in the aftermath of Hurricane Katrina - "I might likely have to punch him - literally." "If one person criticizes [our sheriffs], or says one more thing, including the president of the United States, he will hear from me - one more word about it after this show airs and I - I might likely have to punch him - literally," Landrieu railed on "ABC's "This...