“For whatever reason”.
Legacy media blackout against anything the Democrats proposed, with relentless scrutiny from even the more centrist outlets like MSNBC while the rest straight up built a boogeyman scarecrow out of her and attacked non-existent positions with lies of omission (“she won’t condone this made up issue fearmongered by the far right!”).
Online media disinfo campaign with social media flooded with bots and troll networks simultaneously pushing said boogeyman arguments and fearmongering about them, worsening the discussion from both ends of the spectrum but ultimately pushing the needle towards making the left unbearable and the far right more relatable.
At this point I’m pretty confident that this complete saturation makes even an Obama-style candidate untenable in 2028.
Edit:
More importantly, it gives righties a lot of ammunition by allowing them to distort and lie about it all, eg. reeeing abiut “men in girls sports” allows them to mask their dogshit policies.
EVERYTHING gives righties ammunition. They could twist not wanting the homeless to be killed for sport as “Radical Socialism” and blast that shit 24/7 on Fox News for all they care.