My.BarackObama.com is being used by hackers to trick users into downloading a Trojan horse.
The hackers have set up bogus accounts and used them to create blogs. When a user reaches one of the fake blogs, a video window is displayed. Clicking on that video frame takes the user to a malicious website packed with porn.
If the user clicks to view the porn, a message pops up prompting for a video codec to be downloaded and installed. The executable file is not a codec, but rather a Trojan that infects the machine.
The complete article can be found here:
http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9126801