Gardner sworn in as Colorado's new US senator
Gardner said in a statement that serving in the Senate is a "tremendous honor."
Cory Gardner
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Health care, jobs among Gardner's top priorities for Colorado Senate seat
Read moreColorado Republican Cory Gardner is seeking to oust Democrat Mark Udall in one of a handful of key U.S. Senate races.
Chicago Cubs' owners buy $1.4M in anti-Udall TV ads
Read moreA super PAC operated by the Ricketts family is the latest outside group duking it out on TV in one of the hottest U.S. Senate races in the country.
Colorado US Senate race: Udall, Gardner and Kent on the issues
Read moreSee where U.S. Senate candidates Democrat Mark Udall, Libertarian Gaylon Kent, and Republican Cory Gardner stand on a range of issues.
Udall, Gardner tread over familiar territory in final Senate debate
Read moreColorado's Senate candidates struggled to pin the other down on energy policy and reproductive rights Wednesday in their fifth and final debate.
Udall makes closing case as Colorado ballots hit mailboxes
Read moreSen. Mark Udall is enmeshed in a tight race against Rep. Cory Gardner, and polls have shown the contest deadlocked for months.
Democrats reprise pitches for reproductive rights
Read moreReproductive rights have taken center stage in Democratic campaigns.
Sen. Udall, Gardner clash in raucous Senate debate in Pueblo
Read moreControl of the Senate could hinge on the outcome of the race, which has seen six months of bruising attack ads and remains deadlocked in public polls.
Udall, Gardner trade barbs in Senate debate in Denver
Read moreThe debate was the second of three scheduled for this week, making it an important stretch in a pivotal campaign.
Crossroads GPS targets Sen. Udall with millions in campaign ads
Read moreThe nonprofit group founded by Karl Rove is spending $9.7 million in an effort to defeat incumbent Democratic Sen. Mark Udall.
