U.S. Rep. Cory Gardner celebrates in Denver after he was projected to win the U.S. Senate seat in Colorado on Tuesday, November 4.
Colorado's Senate race —
U.S. Rep. Cory Gardner celebrates in Denver after he was projected to win the U.S. Senate seat in Colorado on Tuesday, November 4.
Chris Schneider/AP
Sen. Mark Udall delivers his concession speech to Democratic supporters in Denver on November 4.
Colorado's Senate race —
Sen. Mark Udall delivers his concession speech to Democratic supporters in Denver on November 4.
Jack Dempsey/AP
Udall exits his campaign bus during an Election Day visit to the University of Colorado in Boulder, Colorado.
Colorado's Senate race —
Udall exits his campaign bus during an Election Day visit to the University of Colorado in Boulder, Colorado.
Brennan Linsley/AP
Gardner joins supporters on the corner of a major intersection in Centennial, Colorado, a Denver suburb, on Election Day.
Colorado's Senate race —
Gardner joins supporters on the corner of a major intersection in Centennial, Colorado, a Denver suburb, on Election Day.
David Zalubowski/AP
Voters in Thornton, Colorado, head into a polling place to drop off their ballots on Election Day.
Colorado's Senate race —
Voters in Thornton, Colorado, head into a polling place to drop off their ballots on Election Day.
Jack Dempse/AP
Udall makes a point during a debate last month.
Colorado's Senate race —
Udall makes a point during a debate last month.
David Zalubowsk/AP
Gardner was endorsed by The Denver Post newspaper, which backed Udall six years ago.
Colorado's Senate race —
Gardner was endorsed by The Denver Post newspaper, which backed Udall six years ago.
David Zalubowsk/AP
Udall greets supporters at a campaign rally in downtown Denver on October 15. First lady Michelle Obama and former U.S. Secretary of State Hillary Clinton have each pledged their support for Udall and campaigned for him.
Colorado's Senate race —
Udall greets supporters at a campaign rally in downtown Denver on October 15. First lady Michelle Obama and former U.S. Secretary of State Hillary Clinton have each pledged their support for Udall and campaigned for him.
David Zalubowski/AP
Gardner speaks on Capitol Hill during a hearing on the Affordable Care Act in October 2013. Gardner is a staunch opponent of Obamacare, and he has frequently linked Udall to President Obama's policies.
Colorado's Senate race —
Gardner speaks on Capitol Hill during a hearing on the Affordable Care Act in October 2013. Gardner is a staunch opponent of Obamacare, and he has frequently linked Udall to President Obama's policies.
Alex Wong/Getty Images
Udall and Gardner have faced off in several televised debates.
Colorado's Senate race —
Udall and Gardner have faced off in several televised debates.
Brennan Linsley/AP