Why Lindsay Graham and GOP politicians continue to back Trump?

[mathematic]

15. Graham just won re-election. There only reason is that he's become a true believer

For a lot of other prominent republicans you can guess they're pandering to the cultists or grifting. But what's to gain for graham? He won't be up for re-election for another 6 years so he doesn't need to pander to the cultists and he's a senator from the opposition party so there's no grift to be had.

The only thing that really explains it is that he's become a true believer. He should watch less fox news.