Interesting, I thought he previously ruled out a run. But yup, he's running to be VP.
Everyone who isn't Trump is running to be VP.
Except DeSantis, I think he’s running for real. DeSantis is polling well enough to potentially be the nominee, and Trump won’t pick him for VP. In fact, since Trump and DeSantis are both Florida residents, Trump can’t pick DeSantis for VP without forfeiting Florida’s electoral votes per the Constitution. He can’t win without Florida, so unless Trump becomes a New York resident again, DeSantis is a no go (not that it would happen at this point, anyways. Trump seems to strongly dislike DeSantis now).
Afaik it's a relic of the time when the EC elected president and VP on the same ballot to prevent the electors of a state from just voting for two of their own for president. They had to give an alternative preference to someone not from their state. The procedure has been changed, but the provision sort of remained. It's one of these cases where no one actually knows what is legal and what is not because we never actually had to find out. It has always been more efficient for the parties to just find a workaround.
