I'm not sure if this will work, and it is certainly not my idea, but when Barrack Obama was dealing with a lot of BS about him on the web, he started his own web site to set the record straight. His developers and SEO guys created a site that took word for word everything negative said online and optimized the content for the negative phrases. When people clicked on his link, the site showed the negative comment prominently (so the content was inline with the SEO) then he followed those comments with the facts.
For example, there was a ton about Obama not being a Christian, so he used the exact keywords and phrases optimised for being Muslim and all that, and then beneath the slander, he had a box that read 'The Facts' or something to that affect where he went through point by point, in very professional, non-emotional language to set the record straight.
I believe Andy Beal wrote it in Marketing Pilgrim, but I could be wrong about that. You might want to do a search.
I believe there may have also been a blog or forum on Obama's site so people could vent there skepticism which put the control back in the campaigns hands and not in the hands of spin doctors.
It's worth a try if this guy really is a good guy, but I would also suggest you do some more research to make sure he's on the up and up.