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

CNN's David AxelrodDavid AxelrodKrystal Ball: Patrick's 2020 bid is particularly 'troublesome' for Warren David Axelrod: Bloomberg entry 'not exactly a vote of confidence' in Biden Trump thanks Reid for warning Democrats not to underestimate him MORE mocked a tweet from former Vice President Joe BidenJoe BidenBudget official says he didn't know why military aid was delayed: report Growing 2020 field underscores Democratic divide READ: Foreign service officer Jennifer Williams' closed-door testimony from the House impeachment inquiry 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 SandersSinger Neil Young says that America's presidents haven't done enough address climate change New poll catapults Buttigieg to frontrunner position in Iowa Growing 2020 field underscores Democratic divide MORE (I-Vt.) at 16 percent, Sen. Elizabeth WarrenElizabeth Ann WarrenNew poll catapults Buttigieg to frontrunner position in Iowa Bloomberg, Patrick take different approaches after late entries into primary race Deval Patrick: a short runway, but potential to get airborne MORE (D-Mass.) at 15 percent and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegNew poll catapults Buttigieg to frontrunner position in Iowa Growing 2020 field underscores Democratic divide Deval Patrick: a short runway, but potential to get airborne MORE (D) at 14 percent.