Once again, we are embroiled in debate over immigration — and especially over the 11 million-plus migrants without papers who don't have trouble finding jobs. Don't expect a quick fix. We need to secure our borders and fix our broken immigration system. But simplistic solutions — such as building walls and militarizing the border, or deporting a population as large as Ohio's — won't do it. Nor will we get improved results by redoubling measures that haven't worked. Since 2000, President Bush has been calling for comprehensive immigration reform. But until now, his calls only galvanized the ultra-conservative elements in...