The general expectation in these threads is that nothing less than a reincarnated Lenin is acceptable, and any realistic candidate is a dirty liberal for whatever reason. Anyway... For the majority of Americans (the PoV that counts in this case, materialistically speaking), Zhoran Mamdani is the most prominent socialist. For a smaller part Piker is, wether you like it or not. And since they think marxist, socialist and communist are exactly the same things... You have your answer.