I’m sure there’s deeper takes on this but from my understanding, it’s a mix of things: 1) he convinced them he’s not like other politicians (which is true, he was not a politician at all) and 2) he convinced them he’s the “pull yourself up by the jockstrap” American dream and everyone can be like him - that’s just the typical American lie they’ve been using for decades if not longer. Then sprinkle a little bit of christofacist fear mongering in there and you got some undereducated folks excited to see someone who’ll “fight” for their American dream.