With his dark tailored suits and his silver banker's coif, Philip Mangano looks like a liberal Democrat's idea of a conservative Republican's idea of an advocate for the poor—which, as the Bush Administration's homelessness czar, he happens to be. It is difficult to imagine Mangano fasting on the Capitol steps in a ratty Army-surplus jacket, as the late activist for the homeless Mitch Snyder once did, much less winning over the bleeding hearts in the nonprofit world by promising to apply the President's governing philosophy to their cause. But the latter is precisely what he does. "Any investment we make...