A Republican Death Spiral?

Nate Silver notices something I hadn't:

It's not just the goose egg that the House Republicans laid on the Democratic stimulus package yesterday: Boehner's Boys have been equally uncooperative on other matters. Case in point: a bill yesterday to delay the transition to digital TV.   This measure was approved unanimously by the Senate; every Senate Republican gave it the green light.  But 155 out of 178 House Republicans voted against it, which resulted in the measure's defeat since a two-thirds majority would have been required for passage under the House's suspension of the rules.

Or, take the Ledbetter Fair Pay Act, a seemingly fairly popular/populist (if not inscrutable) piece of legislation on gender-based pay discrepancies. This was something that Barack Obama whacked John McCain on on the campaign trail, with McCain offering little rebuttal. In the Senate, five Republicans -- out of 41 -- voted with the Administration on Ledbetter, including all four Republican women. In the House, just three Republicans did -- out of 178.