The House GOP is right (and both Senate parties wrong) on the economics of the payroll tax cut. Whether one believes that tax cuts help spur economic activity by increasing Aggregate Demand or by increasing incentives to productivity, a two-month measure is basically worthless. People, especially business owners in this case, don't make long-term employment decisions based on a few dollars difference for 2 months.
Of course, one can qualify the statement on rightness here: temporary tax cuts are a dumb idea in general. Do we want people hired for short stints or for the long term?