The FT predictions for 2012 say that Bloomberg steps in in August... Wind power
Bloomberg is just Romney with shitty hair and an incredibly annoying voice that makes him sound like he's an 80-year-old woman running the perfume bar at Macy's, but for some reason everybody in Georgetown thinks he's Ross Perot. Conservatives want live babies so they can raise them to be dead soldiers. - George Carlin
Bloomberg doesn't have the money, doesn't have the support, doesn't have the contacts, doesn't have the organization.
The GOP candidate will be: Romney, Gingrich, or Santorum. At the moment it looks like Romney although he is only scrapping by with 33% national support (data from Gallup Daily Tracking.)