I'm not USian, so take this with a tablespoon of salt. My understanding is that he had some awful takes about AES countries in the past (seems to be better in some respects now, but I'm not sure to what extent). He seems like the least bad candidate by a wide margin (although that's not saying much), but I'd still be cautious about investing too much effort into electoralism -- of course, an anti-imperialist is not going to be allowed to win, so it all depends on whether the movement surrounding him can be used to prepare for revolution, e.g. if it's going to work with indigenous movements, the African People's Socialist Party, etc.