US elections only.

Any primary OR general election at the state, congressional, or local level is fit to resolve this.

Ballot initiatives count.

Both candidates have to publicly support somebody in a race. Races where one backs someone but the other backs no one won't be enough for a YES.

"Publicly support" means some actual support: an endorsement, campaign funding, things of this nature. Regular twitter actions - liking or retweeting a post by a candidate or expressing simple agreement, for example - aren't enough for a resolution. It has to be actual substantive backing.