CTLAWYER,
“The OP posed a physical impossibility To vote for a dead non-US citizen who was also a non-member of the Democrat Party in a primary.”
1. While we’re picking nits, it’s the Democratic Party, not Democrat. The latter is typically used as an epithet.
2. I also believe the OP was a troll post, but surely you understand that it was a hypothetical, and thus being literally possible was not really relevant? If you want, interpret the question as, “if a person like Stalin was running in a primary…”