David Axelrod David AxelrodThe Memo: Warning signs flash for Trump on debates GOP hunts for leverage in revived COVID-19 talks Pelosi says there shouldn't be any debates between Biden and Trump MORE, longtime political commentator and former chief campaign strategist for former President Obama, tweeted Thursday night that billionaire Michael Bloomberg Michael BloombergBloomberg rolls out M ad buy to boost Biden in Florida Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Bloomberg pays fines for 32,000 felons in Florida so they can vote MORE's possible entrance into the fray of the Democratic primary was "not exactly a vote of confidence" for former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida 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.