

Michael Bloomberg at a news conference at the COP21 climate summit in Paris, on Dec. 4, 2015. (Photo: Christophe Morin/Bloomberg/Getty)
Michael Bloomberg, the billionaire former three-term mayor of New York City, has decided against mounting a third-party White House bid. There are no doubt more than a few people at Hillary Clinton’s headquarters in Brooklyn, New York, breathing a sigh of relief. A Bloomberg run would undoubtably have hurt Mrs. Clinton in her own home state, as well as nationwide.