MSNBC's Keith Olberman, never one to shrink from controversy, tonight called upon Pres. Bush and Vice President Cheney to resign in wake of the President's decision to commute the prison sentence for I. Lewis "Scooter" Libby. Olberman said the resignations would spare the nation the pain of impeachment proceedings. Calling the commutation "a pardon in all but name," Olberman said Bush "stabbed the nation in the back," adding: