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Rocker Jon Bon Jovi (news) plays moments before Democratic presidential candidate Sen. John Kerry (news - web sites), D-Mass., took the stage, during a campaign stop on the campus of the University of Pittsburgh, in Pittsburgh, Penn., Friday, April 16, 2004. (AP Photo/Steven Senne)
http://us.news2.yimg.com/us.yimg.com...i_kerry_srs106

Rocker Jon Bon Jovi (news) addresses an audience moments before Democratic presidential candidate Sen. John Kerry (news - web sites), D-Mass., took the stage, during a campaign stop on the campus of the University of Pittsburgh, in Pittsburgh, Penn., Friday, April 16, 2004. (AP Photo/Steven Senne)



Democratic presidential candidate John Kerry (news - web sites), D-Mass, left, welcomes rock star Jon Bon Jovi (news), right, on stage during a campus visit to the University of Pittsburgh Friday April 16, 2004 in Pittsburgh.(AP Photo/Gene J. Puskar)



Democratic presidential candidate John Kerry (news - web sites), D-Mass, right, thanks rock star Jon Bon Jovi (news), left, on stage during a visit to the University of Pittsburgh Friday April 16, 2004 in Pittsburgh.(AP Photo/Gene J. Puskar)