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.
Left of global center? No. Left of USA center? Probably.
https://news.gallup.com/poll/388988/political-ideology-steady-conservatives-moderates-tie.aspx
More Americans identify as conservative than liberal. It’s not something we have to like, and certain policies may be quite different individually, but in order to win nationally, Democrats have to defeat voters’ own self-identification. Obviously it happens, so this isn’t some insurmountable challenge, but the deck is stacked.