From the New York Times:
The spotlight on the two entertainment icons was just the latest flurry of attention for Hollywood backers of presidential candidates. Though Mr. Obama made a splash by picking up the support of David Geffen and Jeffrey Katzenberg of Dreamworks early this year, their partner, Steven Spielberg, and Peter Chernin of News Corp. came out for Mrs. Clinton soon after, scotching any notions that her Hollywood base was deserting her.
Since then Rob Reiner has added his name to Mrs. Clinton’s camp, while Jackson Browne and Bonnie Raitt have come out for John Edwards.
Which only goes to confirm that old political maxim: As goes Bonnie Raitt, so goes John Hiatt.