Yes, this cycle sucks. However, in US there's a need of a coalition of leftist parties to try to get seats in municipal, state and federal elections. There won't be an alternative to the Democrats any soon, especially if the few existing left parties keep fighting against each other for 1% of the vote.
Yes, I know elections will always be a losing game, however, the working class still sees the parliament as their representatives. Communists and leftists in general must have a voice in those.