Mac Thornberry was elected to the U.S. House in 1994, defeating incumbent Democratic Rep. Bill Sarpalius with 55 percent of the vote. He was re-elected in 1996 with 67 percent of the vote, defeating Democrat Samuel Silverman.
Thornberry was re-elected in 1998, defeating Democrat Mark Harmon with 68 percent of the vote. He won re-election in 2000, defeating Curtis Clinesmith with 68 percent of the vote.
In 2002, he was re-elected with 79 percent of the vote against Zane Reese. He has no opponents in 2004.