Though Barack Obama wouldn't be where he is today without nationwide grassroots efforts, today's presidential candidates can't get by without a little help from their celebrity friends. Going beyond endorsements, some celebs are rolling up their sleeves and going to work on the campaign trail, hosting star-studded fundraisers, speaking on behalf of their candidate of choice, and mobilizing the voting population. This year, President Obama appears to have earned more stars in his camp, but you might be surprised at the big names turning out to volunteer their time (and fame) to help out both parties. We've identified 12 of the many celebrities who aren't afraid to get their hands dirty in support of this year's presidential candidates!
12 Celebrities Who Volunteer For This Year's Presidential Campaigns