Hi, I'm a lifelong DNC voter, I think Mamdani is cool and he even got congratulated by Bill Clinton, so I don't think the DNC you're talking about really exist in any sizable number. Also, if we cared about corporate donations we, the DNC, wouldn't have outlawed them for 7 years until the Citizens United SCOTUS decision brought it back.
I think the nail in Cuomo's Coffin was saying him and Trump had a mutual respect, which is not only not true but also pissed off a ton of Democrats.