And then there was one.

Kirsten Gillibrand (D) was sworn in Tuesday as the junior Senator from New York, taking her spot as the 99th Member to be installed in the chamber for the 111th Congress. Still outstanding is the Minnesota Senate seat, where a state panel is weighing the recount between former Sen. Norm Coleman (R) and Democrat Al Franken.

Gillibrand, a former House Member, takes the place of ex-Sen. Hillary Rodham Clinton, who became secretary of State last week.

About a dozen House Members gathered at the back of the Senate chamber to watch Gillibrand take her oath of office from Vice President Joseph Biden. Included in the group was Rep. Charlie Rangel (D-N.Y.), the dean of the New York delegation.

Gillibrand joins the Senate after serving just more than two years in the House. She was first elected in 2006, toppling four-term incumbent Republican Rep. John Sweeney.

Gillibrand will serve in the Senate until 2010, when she will have to run to retain the post.