Vice President Biden and House Speaker John Boehner wait for President Obama's State of the Union address in front of a joint session of Congress in 2012. As vice president, Biden is also leader of the U.S. Senate, but only gets a vote when senators are evenly divided.
Former Massachusetts Sen. Edward William Brooke speaks in the Rotunda on Capitol Hill in Washington, in 2009 during a ceremony where he received the Congressional Gold Medal. Brooke died on Saturday at age 95.
Republican U.S. Senate candidate Dan Sullivan greets supporters on election night in Anchorage. The as-yet-undecided race between Sullivan and Democratic incumbent Sen. Mark Begich was the hottest in the state.
Ted S. Warren/AP
Former U.S. Senate Majority Leader Howard Baker looks to the stage during "A Century of Service" honoring him and Sen. Bob Dole at Mellon Auditorium, Wednesday, in March 2012. Baker's death was announced on Thursday.
Colorado Republican Rep. Cory Gardner officially announces his candidacy for the U.S. Senate at Denver Lumber Co. on March 1. Gardner will run against Democratic incumbent Mark Udall.