BOSTON (AP) — 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.

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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.

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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.

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Copyright 2013 The Associated Press.