“He takes dirty money,” Cuomo said. The clash over donor credibility has now become a defining theme of the race, with both candidates weaponizing each other’s financial backers and portraying them as corrupt or dangerous in an effort to weaken their opponent’s legitimacy. Mamdani has attacked Cuomo over a super PAC, Fix the City, that’s spent $23 million — the largest amount ever in a mayoral primary — with much of those funds coming from Trump-aligned donors and real estate interests, in addition to a multi-million dollar contribution from former Mayor Michael Bloomberg. Mamdani has said the contributions show Cuomo’s...