In 2004, incumbent Democratic U.S. Congressman Chris John of Louisiana's 7th congressional district decided to retire in order to run for the U.S. Senate. John had held the district for eight years without serious difficulty, even though it had been trending increasingly Republican at the national level. Boustany jumped into the race with another Republican, the late David Thibodaux of Lafayette, Democratic state senator Willie Mount of Lake Charles and Democratic state representative Don Cravins Jr. of Opelousas. In the open primary election, Boustany ranked first with 39 percent, with Mount garnering 25 percent for second place. Under Louisiana's nonpartisan blanket primary system, in the event no candidate wins a "50 percent plus one vote" total, a runoff is conducted between the two top candidates, regardless of party.