NAB, I think you underestimate the degree to which people are just fed up with the establishment. I have...acquaintances that openly support Trump on Facebook and whom try to rationalize it in public purview. Trump may be a douchebag but people know what they're getting with him because of it. The others? They'll say whatever they think they have to in order to get elected. They'll lie through their teeth to get into office and most already have. Trump doesn't hide his flaws as one of them is his total lack of awareness of his own character - that makes his attractive to some whom see the the rest of the cadre as bullshit artists.
Consider: Trump has insulted McCain, talked about Megan Kelly's period, and casually assigned all Mexicans as rapists and murderers. The base of the GOP, the hard right, is absolutely fed up with candidates that talk but don't walk. The most recent polls following the debate still have Trump commanding an enormous lead...and Jeb has fallen by the wayside (Perhaps intentionally while this shitfest continues).
He could be out soon but...I just don't see it yet.