Are primary battles good for the party, good for the voters, good for democracy? Or do they just waste money, burn out candidates and spark internal wars? In my new column today at Pajamas Media I look at two primary battles: McCain vs. Hayworth in Arizona and Crist vs. Rubio in Florida. Some party leaders seem to feel these types of brawls weaken the party and make the Republicans look like they are falling apart from the inside. But in reality, they are the firewall that keeps the power in the hands of the voters, not the pseudo-corporate interests of an entrenched party structure.