You vote communist in US?
There's no one to really vote for.
CPUSA: While it'd be loads of ironic fun to vote for the FBI's political party, they just endorse Democratic candidates now.
APL: AFAIK anti-electoral.
RCPUSA: Bob Avakian personality cult.
SEP, SWP, SA, the other SA: lol Trots
PLP: Anti-electoral and out there.
WWP: Batshit fucking insane.
The PSL is my only possible choice and I find them unpalatable for a variety of reasons.
Anyway, I'm not opposed to multi-tendency parties, if I actually like the candidate I'll vote Peace and Freedom sometimes and if I was German I'd likely be a card carrying member of Die Linke (and not just because it's the successor to the SED), I just find ones that purport to be as such but actually aren't unhelpful.