He was just very entertaining. I don't think there's anything deeper than that.
People who only ever vote GOP
Pro lifers
People who thought he was somehow being unfairly prosecuted for Jan 6 and having crates of classified documents in his pool house
Podcast listeners (people who are heavily influenced by Joe Rogan, Tim Poole, and the like)
People who are ideologically aligned with Stephen Miller
And, drumroll...
Centrists who believed the GOP talking point that Biden was the sole or primary cause of inflation. To their discredit, the dems seemed to have no interest in refuting it.
Trump was the name on everyone's lips. Could it be possible that introduced an implicit bias in his favor? Is this a case of "any publicity is good publicity"?