Cool, so start there and drive it forward. Or run a credible third party from the grassroots up.
It’s nonsensical to suggest that “outsider” candidates and beliefs can win in our system when the Tea Party, MAGA, and shit like Moms For Liberty all represent a new direction that has never existed in US politics.
You can’t credibly say it can’t be done, you just don’t want to be the one to do it. That’s fine, but be intellectually honest about it.
Leftist candidates can’t win in the US because leftism isnt popular. If you want to change that, you can.
This is a country that murders leftists when they get too organized