Massachusetts Gov. Deval Patrick (D) has appointed William "Mo" Cowan, his former chief of staff, to fill former Sen. John KerryJohn Forbes KerryJohn Kerry’s memoir title revealed GOP senator: Democratic opposition to Pompeo 'driven 100 percent by politics' North Korea is moved by Pompeo diplomacy, but Dems dig in deeper MORE's (D) seat until a special election is held this summer.

Cowan was considered one of two front-runners for the position, along with Victoria Kennedy, the widow of Sen. Edward Kennedy (D). 

He becomes the second African American now in the Senate, following the appointment of Sen. Tim ScottTimothy (Tim) Eugene ScottPartisan tensions rise as Mueller bill delayed GOP dismisses report that tax law will add .9 trillion to debt Gowdy on video questions how long Pruitt is ‘going to make it’ MORE (R-S.C.) in December. 

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"Mo's service on the front lines in our efforts to manage through the worst economy in 80 years and build a better, stronger Commonwealth for the next generation has earned him the respect and admiration of people throughout government," Patrick said in a statement announcing the appointment.

Former Rep. Barney Frank (D-Mass.) had also pursued the seat, but his outspoken interest might have undermined his chances of winning the appointment.

Kerry was confirmed as secretary of State on Tuesday with overwhelming support. A special election for his seat will be held on June 25, with a primary occurring on April 30.