The only Democrats who carry national enthusiasm are Bernie Sanders and Elizabeth Warren because they appeal to populist progressive policy positions. Even Kirsten Gillibrand listed Bernie Sanders the "leader of the Democratic party". They both consistently rank among the top 2 in most popular politicians in the country..
The writing is on the wall. We know whose popular and who isn't, and more importantly, why. Establishment politicians you support aren't popular among the progressive, working class, or African American base. They're not popular with women, unless they're a woman. Midterms will further prove the point. Be patient.