Massachusetts Gov. Deval Patrick (D) has appointed William "Mo" Cowan, his former chief of staff, to fill former Sen. John Kerry'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 Scott (R-S.C.) in December.
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.