For example, let’s say Bernie Sanders was the nominee in 2024 against Trump. A lot of people on the internet seem to like him, even some conservatives. But would liberals fall in line and vote for him enough to beat Trump?
Bernie’s supporters always seem to attack the Democrats liberal base, do you think they’d sit home if Bernie or any leftist was the nominee.
In terms of what he got done, he’s easily the most left wing President since LBJ. Perhaps FDR. Whether or not that is defined as left-wing/leftist/liberal is a matter of opinion.