Simple. He's the anti-politician and people hate establishment politicians.
Everyone running against him walks and talks like they've been in government their entire adult life. Those people have had enough of the establishment political class and feel his brash nature represent their collective disdain for the typical politician.
Oh and every time someone twists his words like we've seen on this board already it reinforces the belief that his opposition is just irrational-foaming at the mouth Never Trumpers. The same way how completely insane Republicans looked during Obama's two terms.
He's going to win reelection and I am going to enjoy watching the overreactions.