The GOP House is finding it hard to write a budget. The triggers weren't scary enough to force Dems and Repubs on the super committee to compromise, and they may not be scary enough to get a majority of the GOP representatives to agree either.
Some Repubs want to spare the Defense department and have the cuts come from the big entitlements (Medicare, Medicaid, and Social Security). Others fear voter backlash if they touch entitlements, so they want cuts to come per the debt ceiling deal, which gives plentiful ass-coverage. These automatic cuts would hit defense and non-defense discretionary spending. There many even be a few wildcard Repubs who want something else entirely, such as Ron Paul with his $1 trillion in cuts.
Extrapolating from the payroll tax cut extension, I think I'm ready to predict capitulation to the debt ceiling triggers. My guess is that's the preference of the same group that surrendered on the payroll tax.
But it would be more enjoyable if they can't compromise, and some competing visions of cuts get aired. It would be even better if the Dems offered some budgets, but they're too wary to do that. Dems with discipline are no fun at all!
Update 3/15/12. From a less muddled article, it appears that the GOP split is over how far below the agreed budget limit to go. And the Dems are complaining that a lack of agreement could lead to a shutdown showdown. According to last August agreement, that was not an option for 2012.