Source: CNN
Brain - Michael Bloomberg expected to file for Alabama 2020 primary
Key Highlights

Bloomberg's possible entrance comes as Joe Biden's campaign struggles to break out of the Democratic field and as Elizabeth Warren of Massachusetts rises in the Democratic primary campaign

Bloomberg was one of the least popular candidates considering running for the Democratic nomination

Bloomberg entering the race could pose a threat

A number of Democratic operatives told CNN they believed that a Bloomberg campaign would be doomed by the mayor's positions on policing, ties to Wall Street and the fact that he had spent much of his time in politics as a Republican and independent

But Bloomberg also would bring considerable strengths to a campaign that he has spent millions on Democratic causes for years