Elizabeth Warren has been sworn in as the state's newest U.S. Senator, the first woman from Massachusetts to hold the office.
The Democratic lawmaker took the oath of office during a ceremony Thursday in the Senate chambers in Washington, D.C.
Vice President Joe Biden administered the oath.
Moments before the swearing-in, Warren sent an email to supporters thanking them for their help in last year's election.
Warren is planning to hold a reception and re-enactment of her swearing in ceremony on Saturday at Roxbury Community College in Boston.
Supreme Court Justice Elena Kagan will perform the mock swearing-in.
Kagan, the former dean of Harvard Law School where Warren taught, briefly became an issue during the election that propelled Warren into the Senate and ousted former Republican Sen. Scott Brown.
