DNC Leadership would rather lose with a neoliberal candidate than win with a progressive one.
That’s because they’re paid by big money donors to prevent any movement to the left while big money donors pay the GOP to move further right. This shifts the center (Overton Window) further and further right over time, causing the Democrats to ultimately move towards the right over time.
Obama said that if he was a politician in the 1980s, he would be considered a Republican, and he wasn’t wrong.
They have no easy path to fix it because they take billionaire and corporate money. If they stopped doing that, the path would’ve been obvious this entire time.