According to the APM Research Lab's Voter Profile Tools (featuring the U.S. Census Bureau's 2019 American Community Survey), the district contained about 628,000 potential voters (citizens, age 18+). Of these, 65% are White and 26% are Latino. Immigrants make up 4% of the district's potential voters. Median income among households (with one or more potential voter) in the district is about $75,100, while 9% of households live below the poverty line. As for the educational attainment of potential voters in the district, 44% hold a bachelor's or higher degree.
In the 2010 election, Lamar Smith defeated Lainey Melnick with 68.9 percent of the vote. Melnick, an Austin real estate broker, officially filed papers with the Federal Election Commission on June 23, 2009 to become a candidate.
Incumbent Lamar Smith faced five challengers in the 2012 general election on November 6, 2012: Candace Duval (Dem), John-Henry Liberty (Lib), Fidel Castillo (Grn), Bill Stout (Grn), and Carlos Pena (Ind).
Lamar Smith did not run for reelection in 2018.
On the Republican side, 18 candidates competed in the March 6 primary, in which no one received a majority. The first- and second-place finishers were, respectively, attorney Chip Roy, who served as chief of staff to Sen. Ted Cruz (R-Tex.) and senior advisor to Texas Gov. Rick Perry (R), and Matt McCall, owner of a business providing human tissue for American military hospitals. Roy and McCall advanced to a May 22 runoff, which Roy won with 52.7% of the vote.
On the Democratic side, four candidates ran to replace Smith: Joseph Kopser, entrepreneur and Army veteran; Derrick Crowe, activist; Elliott McFadden, executive director of Austin B-cycle; and Mary Street Wilson, pastor. No one received a majority in the March 6 primary, so the top two finishers, Wilson and Kopser, advanced to a runoff on May 22. Kopser flipped the primary result in the runoff against Wilson, winning the nomination with 58% of the vote.
The incumbent, Chip Roy, was unopposed for the Republican nomination. Former state Senator Wendy Davis won the Democratic primary runoff. Tom Wakely was nominated by the Green Party caucus. The state Supreme Court insured his inclusion after Wendy Davis tried unsuccessfully to have him removed from the ballot. Perennial candidate Arthur DiBianca is the Libertarian nominee, but Roy joined a last-minute suit to strike his name and other similarly situated Libertarians from the ballot.