A Democratic victory in Georgia's state Senate election on Tuesday put an end to the Republican's two-thirds supermajority.
Jordan will take the seat vacated in August by Republican Hunter Hill, who left the chamber to mount a bid for Georgia governor.
Jordan and Howard were the two candidates to win the most votes in an initial election on Nov. 7, but neither managed to take a majority, sending them to a runoff.
None of the five GOP candidates to run in the initial election made it to the runoff election.
Republicans still hold a significant majority in the state Senate, though with Jordan's victory on Tuesday they no longer hold the supermajority in the chamber that they once did.
The election came about a month after Democratic candidates swept state elections in Virginia, holding onto the governor's mansion and picking up 16 seats in the Virginia House of Delegates. The race was largely seen as a bellwether of the 2018 midterm elections.