From my perspective, a single "Super Primary" has the drawback of candidates focusing attention solely on the three large states of California, Texas and New York. It takes a massive amount of dollars to make the media buys in big markets. It also dilutes retail politics at the person-to-person level.
The present system has worked reasonably well up until the time that Iowa and New Hampshire moved to the left. The more I mull this over, launching the Republican Primary in Tennessee and Oklahoma (as I advocated a few posts back) looks like a reasonable solution. Oklahoma is a clear choice because not one county went for Obama in 2008. Although Tennessee did give us the despicable Al Gore, the fact that he was soundly rejected in 2000 shows that folks in the Volunteer State are right-thinking.
I kind of like NH having a big say in the process since they’re surrounded by blue states. Ya need to know your enemy.
But Iowa just seems sorta pointless. Especially with the caucus style format. Everyone in your neighborhood knows how you voted. Too commie for me...