D. John
King from 1199 to 1216
The article in Politico suggests a couple of possible reasons for the celebrity involvement in the 2012 election like for one Barack Obama's star power and liberal appeal plus because of the social media boom which makes the communication much, much easier. Finally this kind of communication with the stars also works well.
The highest elected position in the Roman Republic was "C. Consul," since it was in fact two Consuls that ruled that entire Roman Republic for quite some time.
The answer is D, the right to a speedy public trial. All trials are public not private.