Obama Calls for the Assassination of an American Citizen?

I've heard this repeated on various news websites, such as Salon.com and freerepublic.com, and I found videos of a Keith Olbermann segment on the matter:Visit msnbc.com for breaking news, world news, and news about the economyVisit msnbc.com for breaking news, world news, and news about the economyAssuming this is true, this is a tremendous violation of this man's rights. A trial where he is