Both parties have rules in place to ensure that the insider gets the nomination. Both parties contain corruption, unfortunately.
If Trump does not secure the GOP domination, at least he will have exposed the corruption in politics and shown Washington insiders that the US is sick of it.
Actually, I don’t think we can be so sure the GOP process has all that much corruption in it. Neither Trump nor Cruz was the “insider” favorite. In fact, they’re practically the “anti-establishment” candidates. Now, on a more local level, it can be reasonably said that some state parties might have rigged the rules to favor one candidate or another; the ones with the caucuses or the county, district and state party conventions. But it’s pretty hard to “rig” an election in which the people actually vote.
Back when I was a Democrat activist, I worked with local, district and state conventions and, yes, they’re not hard to rig at all. Party bigwigs control them. Caucuses can be “swarmed” and often are. McGovern was the first to really do that effectively, and he sure did. His people “swarmed” the caucuses and got him the nomination, but he got massacred in the general because he didn’t really have much popular support.
That’s why more states now have voter primaries than used to be the case. Not many have conventions anymore. Caucuses are probably the least reliable of the prevalent methods. That’s what Obama did to Hillary Clinton in 2008 in Nevada. He “swarmed” the caucus with SIEU people and even hired people. That’s why Bill Clinton went on such a tirade about the Nevada caucuses. That was the beginning of the end for her.
But when it comes to actual voter primaries, about the only thing you can do is “get out the vote”, and it’s hard to do. You have to know who the people are on at least a county basis who favor your candidate. You do that with polling. Then you call them on election day, give them rides, go to their homes, give them coffee, donuts, whatever you have to do to get out the vote. You hold election parties. And you have to have poll checkers at every polling station to see who still has to be brought in. There’s more to it than just that, but that’s the nub of it.
That’s why the primaries that are least subject to rigging are the primaries in which people actually vote. You see, the other candidates’ activists are doing the very same thing.
As a consequence, a lot of the “get out the vote” work has gone by the wayside, and now media advertising has taken the place of a lot of it.
So, when it comes to “insider” stuff, the ones with the party conventions are the most vulnerable to rigging. Caucus states are next. But popular vote primaries are as close to straight as the system gets.
That’s why Trump went on such tirades himself. Colorado was a convention state and that’s why he complains that it was “rigged”. That’s why he keeps talking about how he has two million more votes or whatever it is. He isn’t at all articulate about it, and it’s still “playing by the rules”. He is more popular than Cruz by voter head count, but Cruz has better “engineering” going when “engineering” matters most.