President Obama will campaign with Rep. Joe Sestak (D-Pa.) later this month, the candidate the White House publicly opposed during the Democratic primary earlier this year.

Sestak, who's locked in a tough Senate race with former Rep. Pat Toomey (R-Pa.), will appear with the president in Philadelphia on Sept. 20. 

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"We're honored that the president would do an event with Joe during his trip to Pennsylvania," Sestak spokesman Jonathon Dworkin told the website Politics PA in an e-mail. "He and Joe may have had their differences, but they can agree that it is critical to elect a senator who will put Pennsylvania's working families first." 

The White House backed Sen. Arlen Specter (D-Pa.) in the Democratic primary. Obama campaigned and raised money for Specter in his race against Sestak. 

Earlier this summer, Sestak hedged on whether he wanted a campaign visit from Obama ahead of November, telling reporters that he would welcome campaign help from first lady Michelle ObamaMichelle LeVaughn Robinson ObamaSNL's Melania Trump gets advice from former first ladies ahead of the State of the Union Trump to host Super Bowl watch party at Florida golf club Michelle Obama: Bad behavior in the age of Trump makes teachers' jobs more difficult MORE.  

—This post was updated at 10:12 a.m.