May I? 

While the idea is interesting I don't think the scenario of the US works that well. The most succesful RPs of this kind I have seen are set in a scenario where the country being run is highly instable, facing a crisis or needs to be maneuvered to it. All my criticism of the American political system aside, it's functioning as designed. Which makes it more...dull, than say an RP where Stalin can purge you, parts of your country may break off, and other things.