Robots

Fear not Steven:

For the first law of robotics states that a robot cannot do anything which would injure a human being.

Thus it is a logical impossibility for a robot to participate in the government. Particularly as its head.

So you can see, that despite the fact that they parrot public opinion, and sound as you would expect a robot to sound, they are not in fact robots. In fact what you have to realize that Robots are capable of critical thinking, their circuits are logic based. The presidential candidates haven't yet shown any hint of independant brain function yet.

Also Fear not Jane:

For any of the three can win and you won't be able to tell the difference. In fact they could all three win and you wouldn't be able to tell. They are robots after all.