Pride,

I don't want to rain on your parade too much, but there is a fairly large body of scholarship along these lines already, especially in political science. That is not to say that you cannot put this in a framework that is completely valuable and unique, but you need to do an extensive literature review. You don't want to accidentally plagiarize someone else's already published idea. The person who first comes to mind is Bruce Bueno de Mesquita, who is more famous for his predictive algorithms, and game theory, but who also predicates all of his work on the idea that it is individuals within governments who are seeking their own interests that decide policy.

If you know the literature well, you will write a much better thesis regardless of what topic you choose. THere is a lot to be said for bringing two areas of scholarship into dialogue with each other, as well.