The following is a series of articles explaining how the entire 2016 Republican Presidential race is rigged in order to elect Jeb Bush.
A summary:
Wall Street owns both major parties. There are no differences between the two major parties.
Wall Street wants candidates who will further the interests of Wall Street.
Ergo, they want Jeb Bush and Hillary Clinton.
No one wants Jeb Bush though.
So the GOP establishment has spent the last 3 years changing the rules in order to ensure that Bush would be elected.
Almost all of the GOP candidates are part of the establishment, and they are there to split the vote, in order to ensure that Bush has the most votes.
Donald Trump took a sledgehammer to this plan.
Link
If you scroll to the bottom of that post, there are 20 additional links, outlining the whole GOP strategy.
If you are interested in politics, and how politics actually works, read all of the links.
Believe it, don't believe, it is extensively researched, and it makes sense.