Three-Party System?

How fractured is the Democratic party? Could it be that the showdown between Clinton and Obama has created an unfixable schism? For years I have heard people complain about the fact that we have only two major political parties? Is it possible that this is the year to change that, and that it happened entirely by accident? What would happen if, whether it be Clinton or Obama who gets the nomination, the other were to break off and run as a new political party?

It could happen.

It would be way cool.