Last Monday, Scott Walker, Wisconsin's Republican governor and a presumed GOP presidential hopeful, kicked the hornets' nest that is the immigration debate. He told Glenn Beck's radio show that America needs to "make decisions about a legal immigration system that's based on, first and foremost, protecting American workers and American wages," and that this concern should be "at the forefront of our discussion going forward." Walker's comments are significant because they're something of a reversal for him, but also because they break with the "legal-immigration-good, illegal-immigration-bad" orthodoxy of the GOP establishment. Lumping both forms of immigration together as equally questionable makes sense from an economic perspective; market forces don't care about legal formalities like borders.