The DNC sidelined Bernie like you wouldn't believe as soon as it became clear he had potential to be elected. During one of his April 2016 rallies they livestreamed a "reporter" onsite talking about her drunken adventures the previous night rather than showing his speech, the cheers, and the line around the block to get in, that was going on behind her at the time. AOC made no notable efforts to be genuinely inclusive. Zohran is still trying to reach the caliber to be a contender listed next to the other two names and sounds like the infighting is already coming for him.
I almost mentioned Bernie, but his appeal seems limited to people who are very interested in politics and socialism. I'm not sure I'd classify them as "normal." Openly calling himself a socialist is always going to make that a hard sell with normal Americans outside certain groups. Normal Americans don't mind a fair bit of socialism (Medicare, Medicaid, Social Security, farm subsidies, etc.), but they don't like calling it that.
AOC? Normal people think she's nuts because she's been propped up as "far-left" to make the rest of the party look moderate, but it's not working as well as it used to.
Mamdani hasn't been prominent long enough to say, but his biggest surge in votes came from high turnout among well-off progressive whites, the group that's most out-of-touch with normal people. He also got the youth vote, which is famously fickle. The working-class and poor vote went to Cuomo, so I'd say Mamdani has some work to do to reach "normal people" outside some NYC enclaves. He also has the same limitation Bernie has of labeling himself a socialist.
Yes what a great strategy to embrace the failed ideas of socialism!
You realize support among hispanics will drop to almost zero with that strategy because they know from experience in Latin and South America that such crazy ideas bring nothing but misery to everyone.