Did immigrants really fill 81 percent of the new jobs in Texas over recent years? The Texas Public Policy Foundation has doubts, and their arguments are mostly persuasive. I do not expect this to put a damper on Mitt Romney’s gap-toothed Pat Buchanan act (“Help! The Mexicans are taking over the women’s studies department at the University of Texas! Somebody call Black Jack Pershing!”) but that’s politics, I suppose.