 In the run-up to the 2004 United States presidential election, Aguilera was featured on billboards for the "Only You Can Silence Yourself" online voter registration drive run by the nonpartisan, non-profit campaign "Declare Yourself".In these political advertisements, shot by David LaChapelle, Aguilera was shown with her mouth sewn shut to symbolize the effects of not voting.In late 2007, Aguilera became the spokesperson for "Rock the Vote", through which she encouraged young people to vote in the 2008 presidential election.