All Things Considered continues its look at political races across the nation -- today, the toss-up for the Senate in Washington state. Sen. Patty Murray has held the seat for 18 years. Her Republican opponent, Dino Rossi, says that her time in the Senate has been ineffective, and that she needs to go. The race is seen as a toss-up by many political watchers. NPR's Melissa Block talks to Matt Barreto, political science professor at the University of Washington, in Seattle.