Vice President Joe Biden is traveling to the Winter Olympics in Vancouver, but on the way to British Columbia he'll stop off to campaign for Sen. Patty Murray (D) in Washington, who faces a reelection race that could potentially be tougher than expected in 2010.

Biden is scheduled to attend an event for Murray at 8 a.m. Pacific.

Murray's race has not, generally, been on analysts' radar as a top competitive campaign in 2010, but in late January a Republican polling firm based in Portland found Murray trailing a potential GOP challenger, former (unsuccessful) gubernatorial candidate Dino Rossi, 45% to 43% with 9% undecided.

Rossi has not announced a bid for Murray's seat, and Murray had a solid $5.1 million in her campaign war chest at the end of 2009; she's still favored to win reelection. It won't be clear just how competitive her race is until more polling comes out (the aforementioned survey is the only major one available on her race).

After the event for Murray, Biden will deliver remarks at the Olympic kick-off event for U.S. athletes in Vancouver and attend the opening ceremony.

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