Why did DJT get re-elected in 2024 yet not re-elected in 2020 if he has so many supporters who voted for him in 2024?

It just doesn't compute to my non American brain, why voters either swing vote, or why DJT was a one term president, then Biden got in (swing voters or more democrats, whatever) and then now DJT is in for a second term.

I don't understand the logic of the American voter and the sub category of American swinging voter? Like - I just don't get the craziness of *why even swing vote* versus consistency voting for the same party election after elections.

Why did DJT get re-elected in 2024 yet not re-elected in 2020 if he has so many supporters who voted for him in 2024?
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