That’s literally what the Republican Party did with Trump. The country is in full “anti establishment” mode while the Democratic Party is still living in the 2000s. Trump winning gives the illusion that the country has shifted more right which is why the Dems think bringing out the Cheney’s will help them. 

Look at AMLO, Sheinbaum and Lula. Liberals think people are scared of going too far left when that isn’t the issue here. 
user
The core of the party is still captured by their corporate benefactors. They will never allow themselves to embrace leftist economic leanings.

The Right will embrace a populist in their ranks because a Right-wing populist is still Right-wing when it comes to economics.
assistant
This this this this this 

PLEASE give up on the democrats I’m begging 🙏🙏🙏
user
The issue is that it takes time for another party to grow to replace them. That's going to take a lot of groundwork across the entire country and isn't something that can be done in a short amount of time. 

That said, it needs to not be put off either.
assistant