Celebrities and Ron Paul
I think it would be wonderful to have well-liked and respected celebrities at the march; as participants, speakers, entertainers, etc. Some like Howerd Stern would be controversial enough that any sign of their support would almost do more harm than good (sort of like the brothel owner's "endorsement"). But the main problem is....
Celebrities that have made political statements have traditionally not been helpful to the cause of liberty. Some have personal foibles like Mel Gibson's tendencies to alcohol abuse and politically incorrect statements that the MSM will use to discredit any opinion that he might have. Some, like the Dixie Chicks, seemed to go out on a limb to oppose the war in Iraq early on. But now, when we have a true anti-war candidate and their support would REALLY make a difference, they are no where to be found. Others are disgusting hypocrites like Barbara Steisand with her environmental rhetoric telling us that WE should conserve energy while she keeps an entire house refrigerated to preserve her fur collection. Most are simply spineless (and mindless) tools of the establishment. They may make political gestures that SEEM unpopular at the time, but they are usually about topics of no lasting significance. For example, when was the last time that a celebrity said something that would have educated the American public about the national debt, Federal Reserve, vote fraud, illegal immigration, or even backed a candidate that was saying the truth about these things? Hmmmm. No, they are too busy talking about women's rights, global warming, saving the humped back whale, famine relief, etc. etc. etc. All worthy, wonderful causes but nothing that is going to rock the boat. And when all the smoke has cleared, its business as usual with the same goons in charge in Washington DC.
And this campaign is a prime example of how they could have a very great impact with very little risk or effort on their part.
Don't hold your breath.