Axelrod mocks Biden's 'Best Friends Day' tweet to Obama: 'This is a joke, right?'

CNN's David AxelrodDavid AxelrodSanders, Warren appear to have tense moment onstage after debate Warren faces online criticism over past big donor fundraisers Krystal Ball: Media turns on Buttigieg, will this end him? MORE mocked a tweet from former Vice President Joe BidenJoe BidenLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Ex-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Parnas says he doesn't think that Joe Biden did anything wrong regarding Ukraine MORE to former President Obama celebrating "Best Friends Day," with the former Obama-Biden campaign chief strategist asking if it was joke.

"This is a joke, right?" Axelrod, who hosts "The Axe Files" on CNN, asked in a tweet on Sunday to his 1.1 million followers after Biden, a 2020 presidential candidate, wished Obama "happy #BestFriendsDay” on Saturday. Biden's post included a photo of the bracelets he shared to celebrate his Obama's 55th birthday in Aug. 2016.

Other pundits also jumped in to rib Biden on the friendship tweet.

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Obama has pledged not to give any candidate, including his former vice president, his endorsement during the 2020 Democratic primary.

Biden is currently the front-runner among the 24 candidates seeking the Democratic nomination, but has seen his lead shrink recently.

A Saturday Des Moines Register–CNN poll, for example, has Biden at 24 percent support, with Sen. Bernie SandersBernie SandersEx-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Former Vermont Governor: Sanders 'will play dirty' Hill.TV's Krystal Ball rips Warren over feud with Sanders MORE (I-Vt.) at 16 percent, Sen. Elizabeth WarrenElizabeth Ann WarrenEx-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Former Vermont Governor: Sanders 'will play dirty' Hill.TV's Krystal Ball rips Warren over feud with Sanders MORE (D-Mass.) at 15 percent and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegFormer insurance executive: 'Medicare for all' would eliminate jobs that are 'not needed' Buttigieg says he's proud to be a part of US system amid UK royal family drama Buttigieg asked about 'Mayo Pete' memes by New York Times ed board MORE (D) at 14 percent.