2012Final results
2012 election for Texas's 20th District
U.S. House · Texas
Joaquin Castro (D) won with 63.9% of the vote, defeating David Rosa (R) by 30.4 points.
Joaquin CastroDemocrat · winner
63.9%119,032
David RosaRepublican
33.5%62,376
A. E. "tracy" PottsLibertarian
1.7%3,143
Antonio DiazGreen
0.9%1,626
186,177 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 2012
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.
Joaquin CastroDavid Rosa
$1.5M
Raised by the campaign
$54.8K
$1.4M
Spent by the campaign
$58.4K
$147.1K
Cash on hand
-$3.8K
Campaign money: FEC, through Dec 31, 2012.
Source: FEC campaign filingsUpdated Dec 31, 2012
The candidates
Joaquin Castro (D)David Rosa (R)
Also on the ballot: A. E. "tracy" Potts (Libertarian), 1.7%; Antonio Diaz (Green), 0.9%