Anyone with a brain knows the following. If Donald Trump is denied the nomination, his supporters (including me) will walk away from the Republican Party, thereby ensuring a victory for Hillary Clinton. But maybe the Republican establishment would rather have a President Clinton than a President Trump. I don't rule it out. Neoconservatives (such as Charles Krauthammer and William Kristol) are hopeful that she will carry on the nation-building work of George W. Bush. Lobbyists for big business, free trade, and immigration think they can work with her to get policies they desire. In short, Hillary Clinton can be bought and controlled. Donald Trump is autonomous.
Addendum: Pat Buchanan has been right from the beginning.
