Yes, if only the liberals, who make up a plurality of this country
Not even close to correct. Who are the most popular politicians in this country? Every poll I've seen in the past 10 years has AOC and Bernie at the top, and the only politician who can even compete with their approval ratings is Mamdani.
Liberals make up a plurality of the news media and the wealthy Democratic donors. They aren't plurality of the people. A recent poll has 62% of self identified Democrats saying they want new Democratic leadership, and only 24% saying they like the leadership they have. People are fed up, and they are not looking for more "centrist" Democrats.