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National Democratic gains reverberated in the Mountain States, with the loudest echo in Colorado, where Democrats claimed a decisive majority of the states Congressional delegation.
The Centennial States nine-member delegation will be dominated by seven Democrats in the next Congress, reducing the number of Republican-held seats by half.
Voters ejected incumbent GOP Rep. Marilyn Musgrave in favor of Democratic challenger and former Senate aide Betsy Markey.
Markey, who worked for Sen. Ken Salazar (D), becomes the first Democrat to represent the 4th district since 1972.
Musgrave, who gained notoriety for pushing a bill in 2004 to ban same-sex marriage, failed to duplicate the win that she eked out last cycle, despite the Republican lean of the eastern Colorado district.
In addition, Rep. Mark Udall (D) will ascend to the states open Senate seat, defeating ex-Rep. Bob Schaffer (R) to replace retiring Sen. Wayne Allard (R).
Former state Board of Education President Jared Polis (D) will fill the 2nd district seat now held by Udall, after defeating Republican Scott Starin in the heavily Democratic district.
The states open 6th district seat, vacated by retiring Rep. Tom Tancredo (R), will be filled by Colorado Secretary of State Mike Coffman (R), who overwhelmed Democrat Hank Eng in the solidly Republican district.
Idaho voters appear to have ousted freshman GOP Rep. Bill Sali from the 1st district in favor of Democrat Walk Minnick.
With 99 percent of the states vote tallied, Minnick, a wealthy former chief executive officer of a forest products company, leads 51 percent to 49 percent.
Minnick positioned himself in the race as a libertarian-style moderate and gained the backing of several high-profile Republicans, while Sali failed to win the support of the states top Republicans, including Gov. Butch Otter.
Republicans retained control of Idahos open Senate seat as expected, with Lt. Gov. Jim Risch (R) easily defeating ex-Rep. Larry LaRocco (D) to replace retiring GOP Sen. Larry Craig.
The contest amounted to a repeat of the states 2006 race for the lieutenant governors office, in which Risch defeated LaRocco by nearly 20 points.
According to unofficial state returns Wednesday, Risch claimed about 58 percent to LaRoccos 34 percent.
In Wyoming, Republicans maintained their stranglehold on the states Congressional delegation, sweeping both Senate contests as well as the states open at-large House seat.
After defeating Internet entrepreneur Gary Trauner (D) by about 10 points, former two-term state Treasurer Cynthia Lummis (R) will replace retiring GOP Rep. Barbara Cubin.
Although Trauner came close to ousting Cubin in 2006, the incumbent lawmaker was weighted down by her own unpopularity at home as well as national GOP difficulties that cycle challenges not faced by Lummis.
Sen. Mike Enzi (R) easily won election to his third term over Democrat and college professor Chris Rothfuss (D), claiming more than 75 percent of the vote in the states unofficial vote tallies.
Similarly, GOP Sen. John Barrasso took more than 70 percent of the vote in a special election to complete the term of Sen. Craig Thomas (R), who died in early 2007.
Barrasso, appointed to the Senate seat after Thomas death, defeated attorney Nick Carter (D) to serve until the seats next regular election in 2012.