During the
2003 Texas redistricting, the 24th District, represented by 13-term
Democrat Martin Frost, was reconfigured to be significantly more Republican. The old 24th had covered mostly Democratic areas around Dallas, Fort Worth, and
Arlington. However, the reconfigured district shed its portions of Arlington and Fort Worth, replacing them with more suburban and Republican territory around Dallas. Had the district existed in 2000,
George W. Bush would have won it with 68 percent of the vote. Marchant ran for the redrawn district and was elected to Congress in 2004. He was reelected in 2006 (with 60% of the ballots cast) and 2008 (with 56% of the ballots cast). In 2014 he joined the newly founded
Friends of Wales Caucus. Marchant won his seventh term in the House in the general election held on November 8, 2016. With 154,845 votes (56.2 percent), he defeated Democrat Jan McDowell, who received 108,389 (39.3 percent). Two other candidates held the remaining 4.5 percent of the ballots cast. Marchant narrowly won his eighth term in the House in the general election held on November 6, 2018. With 133,317 votes, 50.6%, with Democrat Jan McDowell receiving 125,231 votes, 47.5%. The margin of victory of 3.1% over his Democratic opponent was a marked reduction from the same campaign between the two in 2016, with a difference of 16.9% then. Libertarian Mike Kolls received 4,870 votes, 1.8%. ==Personal life==