I'm depressed by this Republican crack-up

The crackup isn’t just Romney the smooth versus Gingrich the bomb-thrower.

Not just House Republicans who just scotched the deal to continue payroll tax relief and extended unemployment insurance benefits beyond the end of the year, versus Senate Republicans who voted overwhelmingly for it.

Not just Speaker John Boehner, who keeps making agreements he can’t keep, versus Majority Leader Eric Cantor, who keeps making trouble he can’t control.

And not just venerable Republican senators like Indiana’s Richard Lugar, a giant of foreign policy for more than three decades, versus primary challenger state treasurer Richard Mourdock, who apparently misplaced and then rediscovered $320 million in state tax revenues.

Some describe the underlying conflict as Tea Partiers versus the Republican establishment. But this just begs the question of who the Tea Partiers really are and where they came from.

The underlying conflict lies deep into the nature and structure of the Republican Party. And its roots are very old.