The campaign is using social media to promote a drawing for a one-of-a-kind guitar signed by both the "Born Free" singer and Paul RyanPaul Davis RyanWhite House faces growing outcry over migrant family policies John Legend slams Paul Ryan for Father's Day tweet, demands end to family separation Trump faces Father’s Day pleas to end separations of migrant families MORE. Unlike past fundraising contests that have offered dinner with Romney, Ryan or Ann Romney as the prize, this contest does not ask for donations. Entering the contest is free, making it more possible for a Kid Rock fan who is not a fan of Romney to end up with a guitar signed by the GOP vice presidential candidate.

"Paul Ryan and Mitt Romney may have different playlists, but both can appreciate America's rock and roll tradition," reads the text on an entry form on the Romney website. 

Romney and Ryan joked about the difference in their musical tastes at the Republican National Convention. Ryan enjoys Rage Against the Machine, Led Zeppelin and AC/DC, while Romney's playlist includes music from the film "O Brother, Where Art Thou?" and the Commodores. (Perhaps unsurprisingly, given the band's leftist politics, Rage Against the Machine guitarist Tom Morello is no fan of Ryan's, saying as much in a think-piece for Rolling Stone in August.)

Kid Rock has appeared at several Romney campaign events, even introducing Ryan at a rally last week. The campaign often uses his song "Born Free" to accompany Romney's entrance onto and exit from the stage at events.