To understand the American elections try to see we have numbers of different folded nTubes. The media talks about the "Tea Party" or "Religious Conservatives."That is the wrong label. The right label would have 3 different nTubes. One is right wing populism. Another are Protestant evangelicals. A third is mindful Conservatives which is the traditional Republican establishment.
Since Obama was elected, the politicians in Congress have synchronized all the nTubes with their Intent of winning power. Once the Republican establishment won control of the House of Representatives, the establishment had to disentangle themselves from the right wing populists and the evangelicals. They are no longer necessary to get power.
The National Review, an organ of Republican Conservatives founded by William Buckley, has come out strongly against Donald Trump. The Koch brothers said in an editorial in the Wall Street Journal that cannot support either Donald Trump or Ted Cruz.