The only alternative is Trump, who isn't even a perceived leftist but is, in fact, very right-wing. The only two people who will become president is either a person who is extremely right-wing and might become a fascist dictator (Trump), or someone who is more left-leaning than the other but isn't a leftist, but is only precieved as a leftist by some, and who likely won't become a fascist dictator (Harris). Out of the two options, Harris is the better option for leftists.