Colorado's new junior U.S. senator, Michael Bennet, officially took his seat in the "world's greatest deliberative body" Thursday when Vice President Joe Biden administered the oath of office.
Bennet, 44, becomes the chamber's youngest member as he replaces Interior Secretary Ken Salazar.
Bennet has said he will seek appointment to the Senate Agriculture, Nutrition and Forestry Committee.
He must stand for election in 2010 if he wishes to serve a full six-year term.