The congressman's win over the Democratic incumbent is critical for the GOP's majority hopes.
Uber's affiliate in Denver is offering discounted rates for voters heading to the polls.
The first lady incorrectly identified Sen. Mark Udall (D) as "a fifth-generation Coloradan."
Ten senators said they are "troubled" by the administration's moves on family detention.
Democrat stood by his vote for ObamaCare while Gardner tacked to center on immigration.
GOP-aligned Crossroads GPS released an ad hitting Sen. Udall for his support of ObamaCare.
A push to ban the drilling technique could hurt Sen. Mark Udall's (D) reelection chances.
Purple Colorado’s positions diverge on two core social issues.
Dems begin to abandon VA secretary and Republicans call for new leadership.
An intraparty fight on exports has stalled Senate action on an energy efficiency bill.
The 26-year-old was arrested after allegedly breaking into three cars.
The Senate advanced the nomination of Katherine Archuleta to be Director of the Office of Personnel...
Tom Steyer's political action committee spent $65 million in these elections.
The Senate Homeland Security Committee could lose four of nine Democrats.
Michelle Obama heads where her husband can't — Iowa, Colorado and Minnesota.
Democrats Sen. Mark Udall and House hopeful Andrew Romanoff feel the heat.
Sen. Mark Udall (D-Colo.) hit for support of Obamacare and opposition to Keystone pipeline.
The U.S. Chamber of Commerce is pressuring the Senate to take up and “expeditiously” pass a Senate...
President heralds vulnerable senator as "serious person who's trying to do the right thing."
The administration should act "immediately," senators say.
Sen. Mark Udall (Colo.) is the first Democratic senator to call for the VA secretary to quit.
Sens. Ron Wyden (D-Ore.), Martin Heinrich (D-N.M.) and Mark Udall (D-Colo.) slammed the National...
Senate Democrats filed an amendment to the national defense bill Wednesday that would require more...
Former Rep. Bob Schaffer (R-Colo.) has a new gig: selling margaritas. Schaffer, who lost to then-...