I'm also pretty sure that bronz4141 is not a Bloomberg supporter. I think he's just pointing the fact that the media constantly underestimates Bloomberg and that anything could happen. A significant portion of the media believed that Bloomberg would lose the 2001 and 2009 mayoral elections, but he proved them wrong.
Bloomberg would not come close to winning the presidency though.
He won a landslide in 2005 against Fernando Ferrer, who was vying to be the
first Latino mayor of New York City. Imagine if Ferrer had beaten Bloomberg in 2005.