2018Final results
2018 election for Texas's 21st District
U.S. House · Texas
Chip Roy (R) won with 50.2% of the vote, defeating Joseph Kopser (D) by 2.6 points.
Chip RoyRepublican · winner
50.2%177,560
Joseph KopserDemocrat
47.6%168,264
Lee SantosLibertarian
2.1%7,537
353,361 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Joseph KopserChip Roy
$3.3M
Raised by the campaign
$1.9M
$3.2M
Spent by the campaign
$1.8M
$15K
Cash on hand
$137.3K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018