David Axelrod: Bloomberg entry 'not exactly a vote of confidence' in Biden

David AxelrodDavid AxelrodDavid Axelrod: Bloomberg entry 'not exactly a vote of confidence' in Biden Trump thanks Reid for warning Democrats not to underestimate him Reid warns Democrats not to underestimate Trump MORE, longtime political commentator and former chief campaign strategist for former President Obama, tweeted Thursday night that billionaire Michael BloombergMichael Rubens BloombergDemocrats on edge as Iowa points to chaotic race Brown confirms he won't enter 2020 race: 'I think it's a good field' The Memo: Bloomberg's 2020 moves draw ire from Democrats MORE's possible entrance into the fray of the Democratic primary was "not exactly a vote of confidence" for former Vice President Joe BidenJoe BidenImpeachment week: Trump probe hits crucial point Trump DACA fight hits Supreme Court Juan Williams: Honesty, homophobia and Mayor Pete MORE's campaign.

"This is a thunderclap," Axelrod tweeted.

"And not exactly a vote of confidence from leading moderate in durability of @JoeBiden campaign."

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Bloomberg, the former Mayor of New York, is supposedly preparing paperwork to appear on Alabama's Democratic primary ballot ahead of Friday's deadline. 

A Bloomberg adviser close to the situation said that the 77-year-old has been cogitating on launching a campaign for several weeks, but hasn't definitively decided if he will or not.

Getting his name on Alabama's ballot, however, allows him more time to make the decision.