This seems to be the consensus:
DNS doesn't quite work the way that the Whois and the reverse IP make it appear.
Just because barackosama2008.org resolves to the same IP address as hillaryclinton.com doesn't mean that hillaryclinton.com is actually "serving" that domain. All it means is that someone who owns barackosama2008.org decided to point that domain name at hillaryclinton.com's IP address. It doesn't imply ownership. Anyone who would be slimy enough to register barackosama2008.org would be slimy enough to point it at Hillary.
Another reader adds:
The site was registered using a proxy company that registers the domain with their information, instead of the individual having to enter theres. This is a fairly common practice, especially when someone does not want their domain to be traced.
But it is probably not affiliated with the Clinton campaign.
If you notice, the domain originally pointed to GOP.com, they were essentially using it is as a domain alias that routed users to a different site. Then someone pointed it to the Hillary Clinton website. Now it points to Google. The domain was registered way back in January of 2007.
For all we know, it could have been a tech-savvy Obama supporter, just as much as it could be an Edwards or Clinton fan.
Thanks for the emails.