Joseph: you are spouting conventional wisdom and that has been upended all year long. If Rubio withdraws now, that opens the door wide to a trump victory. Rubio stays in and he has a chance-especially as I think that Cruz is going to syphon off many votes from trump.
Sam2- about the only thing that Trump has not done yet is having his brownshirts kill someone. Everything else has been done. Threatening people at his rallies, threatening The Speaker of the House, demonizing minorities and disabled people (remember the eugenic program of the Nazis?), ordering soldiers to commit war crimes….etc. So, Pray tell where the big difference is. Hitler also won elections.