text:  Welcome back to NewsHour. The US President withdraws, partway through his re-election campaign, with a statesman-like address from the Oval Office. That's not a prediction of what's about to happen, that's a description of what did happen in 1968, when the man known as LBJ, Lyndon Baines Johnson, stood aside after months of speculation and growing anger, in his case, over the disastrous progress of the war in Vietnam.