(CNN) - Republican Sen. David Vitter's indiscretions have been a frequently used advertising theme for his Democratic opponent, Rep. Charlie Melancon.
And a biting new ad released Thursday proved no exception.
"Our tax dollars pay David Vitter's salary and he used it for prostitutes," the narrator in the ad says. "In return we got a disgraced senator… The real sin is that David Vitter is still a senator."
Vitter was linked to the so-called D.C. madam in 2007, eventually admitting that he committed a "very serious sin."
The 30-second ad, which is currently airing statewide, uses footage of a suggestively dressed woman and Vitter's press conference after the scandal broke.
According to recent polling, Vitter is leading Melancon by significant margins.
The Vitter campaign did not immediately respond to a request for comment.
– Follow Gabriella Schwarz on Twitter: @schwarzgcnn