They've been raised to "fear the other". The "other" being anyone not white or Christian. When things aren't going well for the lower class twump voter, they scapegoat those "others" they've been taught to hate. It's an easy transition. And all they need is a loudmouthed charismatic dildo to tell them who to hate. Enter charismatic dildo, Donald Trump. He was hitting all the right notes with them.
Now the second type of trump voter, still racist, but wealthy - for them it's all about cornering the wealth by lowering their taxes for them and their corporations. Who raises taxes usually? The Democrats.. so, they leverage the hatred of the lower class twump voter, i.e., don't discourage their racist rhetoric, and harness that hate power for their own means.
Then there's the third type. The nut job conspiracy theorist who thinks Democrats eat babies - trump promotes that shit and they will not listen to anyone or anything that contradicts the propaganda. To these people Tucker Carlson, Alex Jones, and Donald Trump are their champions - sticking it to those gay and nigger-loving Demoncrats.
That's my analysis.