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

CNN's David AxelrodDavid AxelrodHarris faces pressure to define policy proposals Karl Rove: Both parties are 'broken' The Hill's Morning Report - Presented by JUUL Labs - House to vote to condemn Trump tweet MORE mocked a tweet from former Vice President Joe BidenJoe BidenHarris faces pressure to define policy proposals Biden campaign rips 'Medicare for All,' calls on Dems to protect Affordable Care Act Harris voices support for Puerto Rico protesters: 'I stand with them' 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 SandersBullock: I would not have endorsed health care for undocumented immigrants on debate stage Harris faces pressure to define policy proposals Biden campaign rips 'Medicare for All,' calls on Dems to protect Affordable Care Act MORE (I-Vt.) at 16 percent, Sen. Elizabeth WarrenElizabeth Ann WarrenHarris faces pressure to define policy proposals Harris voices support for Puerto Rico protesters: 'I stand with them' Democrats slam Puerto Rico governor over 'shameful' comments, back protesters MORE (D-Mass.) at 15 percent and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegDemocratic strategist predicts most 2020 candidates will drop out in late fall The Hill's 12:30 Report: Trump hits media over 'send her back' coverage The Hill's Campaign Report: Second debate lineups set up high-profile clash MORE (D) at 14 percent.