Yes, that's the official homepage of a certain Barrack Obama. No, it's not porn you'll find there, it's an attempt to trick you into downloading a trojan.
This URL (and others, on the same site) was used in spam posts that someone tried to leave on one of my websites. So what does a good web citizen do? Alert the webmaster, of course. Not for the first time, though, this has turned out to be more difficult than it should be. The only response I've got so far was — political spam, i.e. trying to get me to support Mr. Obama. Do these people even read the emails they get?
What do the Slashdot readers suggest to try to get through to someone in charge of a high-profile website?