I know plenty of people don't believe this but Hillary is damaged goods and she's not winning any election for President ever. Secondly, she has about 200 FBI agents digging through her emails and also the Clinton foundation. I am thinking they will turn up something.
With that said she may be indicted prior to the convention if so she won't even be the nominee. But if indicted after the convention, once they cannot take it away from her, she loses big. If a recommendation of indictment comes from FBI Director Comey and there is no indictment because the Obama administration play politics she still won't win as that will look incredibly bad for her.
So I have no idea who the democrats will put up if there is an indictment before the convention. I will guess Biden.
Damaged Hillary or senile Biden vs. Cruz with Kasich as his running mate. The RNC will never allow Trump the nomination unless he hits 1237 delegates which I think is unlikely.
Cruz wins because he wins Ohio and Florida.
And it is no secret that Rubio was my first choice.