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The Mellencamp primary

From NBC's Abby Livingston
With the battle for Indiana raging, native son and rock star John Mellencamp has managed what few liberals and Democrats have done: He is campaigning on behalf of both Obama and Clinton.

Mellencamp, a pro-labor and Farm Aid activist, endorsed John Edwards early in the 2008 cycle. But in the last few weeks, he has performedĀ for both Obama and Clinton. The candidates, in return, have made various Mellencamp songs a staple in their event playlists during their Hoosier State barnstorms.

Mellencamp writes on his Web site, "John Mellencamp is a long-time supporter of the Democratic Party which he feels represents the best hope for sorely needed change in this country. He is lending his support to welcome both of the candidates as a Hoosier and a Democrat."