Nothing as far as I can tell. He hasn't changed. People are just getting to listen to him. He doesn't know how bad he sounds when he is rambling about things he doesn't understand. People seem to expect a man with a career in congress to either know something about world affairs or keep his mouth shut.
Exactly - the problem is the candidate.
Some of what he says makes sense - but if you want to avoid being dismissed as a raving lunatic, you should probably stop raving like a lunatic. A deeper voice and correct pronunciation probably wouldn’t hurt things.
He makes for painful listening.
Then some of what his says is madness. Even my wife (she’s no political wonk) said that his rambling that Israel should have kicked Hussein out of Kuwait was kooky.