Cowan was selected by Gov. Deval Patrick (D-Mass.) to temporarily fill Kerry’s former seat. A special election will be held in June to decide who will serve Massachusetts on a longer-term basis. 

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Rep. Ed MarkeyEd MarkeyDem senators ask Bannon for more info about Breitbart contact Dem lawmaker: FCC now stands for 'Forgetting Choice and Competition' Senate Dems want Trump to release ethics waivers, visitor logs MORE (D-Mass.) has announced that he will run in the special election. Former Sen. Scott Brown (R-Mass.) has said he won’t run.

Kerry, who attended the swearing in, left the Senate to serve in President Obama’s cabinet as secretary of State. The Senate overwhelmingly confirmed Kerry for the position last week.

Members of the chamber applauded as Cowan signed the oath of office. Sen. Tim ScottTim ScottLobbying World Juan Williams: The complicated story of black conservatism We need to pass the Anti-Semitism Awareness Act to fight hate and bigotry MORE (R-S.C.), the only other African American currently serving in the Senate, was one of the first people to shake Cowan's hand after he was sworn in.