2016Final results
2016 election for Colorado's 4th District
U.S. House · Colorado
Ken Buck (R) won with 63.5% of the vote, defeating Bob Seay (D) by 31.9 points.
Ken BuckRepublican · winner
63.5%248,230
Bob SeayDemocrat
31.7%123,642
Bruce GriffithLibertarian
4.8%18,761
Donald HowbertRepublican
0.0%2
The same year, the district voted R+23.2 for president; this race was R+31.9.390,635 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 4:52 AM ET
The seat over time
D − R margin in this seat's races around 2016
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 4:52 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Bob SeayKen Buck
$73.8K
Raised by the campaign
$1M
$73.6K
Spent by the campaign
$759.7K
$307
Cash on hand
$401K
Campaign money: FEC, through Dec 31, 2016.
Source: FEC campaign filingsUpdated Dec 31, 2016
The candidates
Ken Buck (R)Bob Seay (D)
Also on the ballot: Bruce Griffith (Libertarian), 4.8%; Donald Howbert (Republican), 0.0%