Trump is the only one that can beat Hillary.
Which is why the eGOP infiltrated the Cruz campaign (and were welcomed with open arms, Jeb, Lindsey Graham etc)
The republicans want Hillary to win and they know they can't sway Trump to their position.
I doubt blackmail would work on him.
Hillary isn't the only one that has compromising files on almost all top level politicians.
You are welcome to your own insane opinion, but every poll taken disagrees with you. And I know, I know, all polls are wrong (except the ones that show Trump winning of course - those are right up there with the 10 Commandments, handed down by God Himself...).