The most protracted presidential campaign departure I can recall before the present example was Wesley Clark’s in 2004, and that was only because the general got cold feet halfway down an elevator in Memphis heading toward his withdrawal speech after the Tennessee Democratic Primary. As a result he made the press corps take an extra bus ride to Little Rock the next day before he faced the inevitable.
That was nothing compared to Newt, of course. In what he may well consider to be a template for how future unsuccessful candidates should structure their goodbyes, Gingrich let it be known a week in advance that he’d be officially leaving the campaign on Tuesday, and then – you’ve got to love this guy – postponed the announcement until Wednesday.