If I had to select a single criteria as the basis for how one should vote, I would rely most on public employee labor union endorsements.
Unions do great work researching the candidates, and making their selections. For them, making the right endorsements is perhaps their highest priority.
Let the unions do all your legwork for elections. Whoever the unions endorse, you can’t go wrong — voting for the OTHER candidate.
As the pundit H. L. Mencken put it, “elections are sort of an advance auction of stolen property.” Union endorsements tell us who was the highest bidder.