I wasn’t taking about forming a new party. There are many parties out there already. People’s Party, Green Party, Libertarian Party… I’m talking about why people don’t vote for them. If Bernie and AOC formed a new party they would face the same issues as all the other parties. In the end they would have work with Democrats and most probably would be absorbed by them.

How do they work?

In democracies with multi-party systems you have two voting rounds. In first every party presents a candidate. If anyone gets over 50% of votes he wins and that’s that. If no one gets more than 50% two candidates with most votes go to second round.

In U.S. you have only one round and usually it’s super close. If 3rd party candidate enters the race and gets even 1% of Democrat votes the Republican will win for sure. That’s why Bernie took part in Democratic primaries. His only chance was to win those and run as Democrat candidate. That’s also why Tea Party and MAGA movements were integrated into Republican party even though they started outside of it. If you want 3rd party candidates to run in elections you would have to change the system completely.

In U.S. you would still have to participate in Democratic primaries so this would come down to creating a new wing inside democratic party. This was done before and didn’t change much. The geriatric party leaders would still control everything.