John Breaux Democratic David Vitter Republican The 2004 United States Senate election in Louisiana was held on November 2, 2004.

Breaux, considered the most popular politician in Louisiana, endorsed Chris John prior to the jungle primary.

[1] During the campaign, Vitter was accused by a member of the Louisiana Republican State Central Committee of having had a lengthy affair with a prostitute in New Orleans.

The open seat was won by John Neely Kennedy, the second losing Democratic candidate from the 2004 race.

In the interim, Kennedy switched parties in 2007 and unsuccessfully ran for Louisiana's other Senate seat in 2008 as a Republican.