I cant reason people out of a position they didnt reason themselves into. You are mistaken to believe that simply adopting more liberal policies like Medicare for all is going to win the election for democrats. Harris positions on key issues were objectively more popular than Trumps. And most on the left in America lean fairly centrist.  There is a media literacy issue in America, a propaganda issue in America, a massive corruption issue in America, that is all leading to someone like Trump winning the election. A not-insignificant number of people were confused as to why Biden wasnt on the ballot on Election Day, for instance. If they dont even know whos running for office, how can they be expected to know what positions a candidate stands for or which one is absolutely full of shit? Its not like the information was difficult to find or assess. Voters just dont really care, and they wont until they are severely impacted by their choices. Trump is ensuring we are well on our way there, I think just like 2020 we wont have to do anything Trump will self-destruct yet again, because he cant govern and hes a terrible liar and a terrible human being.