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My concern over a Trump Presidency is that, unlike incumbents before him, he doesn't appear to actually understand how politics works. I watched an amazing drama about Lydon B. Johnson last week (highly recommended, it's on Sky and called 'All The Way', starring Brian Cranston) and after it, I read up about him.
I was amazed at his political guile. He was pretty amazing in the way that he ensured Congress and the House of Representatives fell behind him in getting Civil Rights Amendments through the house.
What I'm getting at is...aside from the rhetoric that gets you into the White House, you absolutely need to have a sure grip on the subtleties of the American political system.
Even Ross Perot (the last businessmen to run) was politically savvy.
I worry that Trump might be a Harding in the making...