“IS Trump a proven winner in the House? Senate? Any elected office yet?”
The problem IS those “winners” in DC.
The lack of political office is the expressed reason Trump is leading.
I’m not disputing that, I’m simply pointing out that the premise is a no sequitur and that if Trump wins and doesn’t have the support of majorities he will be just as effective as Rubio or Cruz, unless he rules by fiat, which I believe he condemned bammy for.