SENATE In 2008, all 435 U.S. House seats and 34 of the Senate's 100 seats will be on the ballot. Republicans will be defending 22 seats; Democrats have 12 incumbents. Contested Senate Races Here are some Senate races that could be close: Maine: I-Susan Collins (R) Tom Allen (D) Minnesota: I-Norm Coleman (R) Mike Ciresi (D) Al Franken (D) New Hampshire: I-John Sununu (R) Jay Buckey (D) Steve Marchand (D) Katrina Swett (D)