Isn't political dialogue one of the main gripes with the prequels? Politics should indeed be mentioned, but I would stress that the Republic is a bureaucracy, not something that needs to be particularly understood.

Remember that War is in the title. It should be about that above all else. Probably the Clone War. So what sides are there in this war? Are clones enemies or allies? Alternately, is it about a clone of an important person that the war is started?

On another note, something that should probably be addressed is the fact that practically everyone on Earth knows that the Republic becomes an Empire. This makes having heroes on the side of the Republic tragic by default, at least if we show the fall of the Republic, which is almost required so that the transition to the OT is not incredibly jarring and disorienting: "Evil Empire? What? I thought that we were winning the war?! Did the other side win?" Etc.