2010Flipped from DemocraticFinal results
2010 election for Colorado's 4th District
U.S. House · Colorado
Cory Gardner (R) won with 52.5% of the vote, defeating Betsy Markey (D) by 11.1 points, a seat Democrats won last time.
Cory GardnerRepublican · winner
52.5%138,634
Betsy MarkeyDemocrat
41.4%109,249
Doug AdenConstitution
4.7%12,312
Ken "wasko" WaszkiewiczIndependent
1.5%3,986
264,181 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 2010
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Betsy MarkeyCory Gardner
$3.6M
Raised by the campaign
$2.4M
$3.6M
Spent by the campaign
$2.4M
$10.6K
Cash on hand
$19K
Campaign money: FEC, through Dec 31, 2010.
Source: FEC campaign filingsUpdated Dec 31, 2010
The candidates
Cory Gardner (R)Betsy Markey (D)
Also on the ballot: Doug Aden (Constitution), 4.7%; Ken "wasko" Waszkiewicz (Independent), 1.5%