As the Democratic Party grows ever closer to officially selecting Barack Obama as its presidential candidate, the Illinois Senator continues to look ahead to the general election in November.

To that end, rock musician and political activist Melissa Etheridge, Usher and Dave Matthews are three of 14 celebrities, politicians and community leaders co-chairing Obama’s national Vote for Change effort. The six-month voter registration drive, which launched May 8, is considered the blueprint for Obama’s general election get-out-the-vote efforts.

Musicians who have voiced their support for Obama in recent months include Bruce Springsteen and the E Street Band, Roger Waters, and the surviving members of the Grateful Dead.

Throwing their support for Sen. Hillary Clinton are Elton John, Barbra Streisand, Tony Bennett, Carole King, Quincy Jones, Carly Simon, Willie Colón, Goo Goo Dolls, Lupe Fiasco, 50Cent, Merle Haggard, Madonna and Barry Manilow.

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Indiana rocker John Mellencamp, who campaigned for former presidential contender John Edwards, has not endorsed either Obama or Clinton, but performed at both candidates’ rallies in Indiana on April 22 and May 3, respectively.