I would consider casting a vote for a hypothetical democrat only in a thought experiment; one who's not a communist, or establishment insider, or is under potential indictment for selling state department favors, or that was plainly guilty of negligent homicide 46-years-ago for the needless death of Mary Jo Kopechne, or who's a racist rabble rouser front for ISIS, or the first gay transsexual inter-species alien.
So that leaves the current and probably future crop of democrat presidential nominees out of the question.