Please tell us what guidelines you use for voting. A person can well be born again, believing that Jesus is Lord, and that God raised Him from the dead, and yet still be mistaken in other matters. That still does not nullify that he is indeed born again.
Voting for someone who claims to be “Christian” means nothing. President Obama makes such a claim. I think he makes that claim because he knows it is helpful if you want to win elections.
Jimmy Carter was a Democrat - I don’t remember that much about him, but as a Democrat, I would assume he was pro abortion, but, I could be wrong.
Can a born-again Christian support abortion, homosexual behaviour, etc? Personally, I don’t think so.