The ceremony was held on the floor of the Senate in the United States Capitol.
The Kentucky Republican had struggled at times to keep his narrow majority in line a year ago, even with a two-seat cushion, and it will only get harder now.
In a statement, Torrie Matous, a Roby campaign spokeswoman, said in the face of Democratic energy going into the 2018 midterms, it was "critical to nominate a responsible conservative who can keep this vital seat in Republicans' hands".
HRC - which opened offices in Alabama in 2014 and first launched its #NoMoore campaign against Roy Moore in 2016 - engaged in a public education campaign about Roy Moore's record during the Republican primary and endorsed Senator Jones in Alabama's hotly-contested special election.
But when he walks down the Senate aisle before the ceremony, he'll reportedly be bucking a Senate tradition in favor of an escort from a very special guest.
Jones, 63, took the oath of office on a family Bible. Moore, who alleged voter fraud in the election and raised money for a supposed investigation, has yet to congratulate Jones on his victory. She becomes the 22nd woman now serving in the Senate, a record. Smith, who served as her state's lieutenant governor, was appointed by Minnesota's governor to replace Franken.
Later, Jones attended a welcome reception in the Kennedy Caucus Room of the Russell Senate Office Building, where potential 2020 Democratic presidential candidates Sens.
"Senator Doug Jones' swearing in today was a historic landmark for Alabama voters", said Sewell on Wednesday. He will be under pressure to find some areas of agreement with Republicans and has cited the funding of infrastructure improvements as one possible avenue.
Aides to both Republicans and Democrats on the committee said the final call will be made by Majority Leader Mitch McConnell, R-Ky., and Minority Leader Charles Schumer, D-N.Y.
"We are moving closer and closer to parity, closer and closer to one another, and I hope closer and closer in solving problems", said Sen. "The American people want to see us work together". Jeff Sessions, who left to become President Trump's attorney general. Howell Heflin. Jones worked for Heflin as a staffer after graduating from law school in 1979. "I know that Doug and I will do well to help move Alabama forward".
Jones campaign chairman Giles Perkins said he expects that's what Jones will do - focusing on health care, especially protecting rural hospitals, and economic issues.