Democrats are NOT leftists, they’re center right at best. They ultimately serve corporate interests and NOT the will of the people.
You will never get universal healthcare, police reform, free college, less military spending, and other leftist ideals from the Democrat party because they’re not leftists. Doing these things runs counter to the interests of their corporate masters.
We have a fascist party and a conservative party, but we don’t actually have a liberal party. We haven’t had one since before Clinton.
Bernie is a leftist politician. The Democrat party is not a liberal leftist party, they’re a conservative corporatist party.