Here’s a really nice video interview of Bruce Bartlett on the issue. Don’t let the fact that it’s MSNBC lead you to automatically dismiss the story as hyper-partisan hogwash. It actually quotes a lot of Republican experts. The basic point is that certain tax cuts can do a decent job stimulating demand for goods and services in a recessionary economy, and certain tax cuts (usually other kinds) can do a decent job encouraging the supply of productive resources (labor supply and saving) in a full(er)-employment economy. But neither type of tax cut is likely to generate so much demand or so much supply that they pay for themselves (a la Laffer), even over the longer run. And once you get long enough into the longer run, chances are any credit you are giving to the tax cut itself is misplaced.
More of my way of explaining this to come in future Tax Notes columns.