 I think Trump is making this pick on who he thinks gives him the best chance to win in November. He announced this decision in a Truth Social post and mentioned a couple of key states in that statement, essentially saying that he thinks Vance can help him win in Pennsylvania, in Michigan, Wisconsin. These are essential states for victory in November, both for Trump and President Biden. Trump won them in 2016, but lost to Biden in those same states in 2020. Hmm.