Former Mayor Michael R. Bloomberg is backing former Gov. Andrew M. Cuomo for mayor of New York City. Former Mayor Michael R. Bloomberg on Tuesday announced that he was backing former Gov. Andrew M. Cuomo in the New York City mayor’s race, giving Mr. Cuomo an endorsement coveted by many of the Democratic candidates in the race.

Cuomo is likely to get more first-choice votes than any other candidate.

Mr. Mamdani has been attacked by both Zionists and supporters of Palestinians, by rival mayoral candidates and by super PACs ready to spend millions of dollars on negative advertising in the last week...