To answer the question of how many voters, it's around 58% of the Democratic voters in this primary, according to this source:
A lot of money was pumped into his campaign, and that seems to make a huge difference.
Given enough money, a smart campaigner could get Mickey Mouse elected to office.
That's the sad and unfortunate truth of American democracy. What's even sadder is that it actually works, that so many people are easily influenced by slick ad campaigns by the forces of belittlement.
Latimer is apparently being painted as a moderate:
But Bowman recognized the power of money and slick advertisements in influencing voters (although he says "brainwashed"):
The divisions in the Democratic Party also appear to be playing out in Westchester County:
Latimer was also the Westchester County Executive, so he would have been well-known and supported among the local party establishment. He was considered an unusually formidable candidate to run against an incumbent in his own party. His supporters say that Israel was not the only issue they opposed Bowman over.
They expect Latimer to win the general election. The Republican candidate is a woman named Miriam Flisser:
Miriam Flisser
Bowman is still running under the Working Families Party, so this could divide the Democratic vote in November.
These divisions within the Democratic Party have existed for a long time, mainly between the centrist-moderate Democrats and the more progressive wing of the party. It got especially ugly during the Vietnam War era, such as the violence surrounding the 1968 Convention.
I'm not sure what direction either party will go at this point, but as it appears, both parties are moving steadily towards the right, although Democrats are not quite so far to the right as the Republicans. That's their only real selling point this election: "Vote Democrat! At least we're better than Trump!"