The only thing more remarkable than the massive number of people who participated in Monday's immigrant rights march here was how quickly and quietly they dispersed upon finally arriving at Grant Park. It was as if they just melted into the background from which they had emerged that morning, seamlessly returning to the shadow society that they have been forced to create for themselves in the absence of sensible immigration laws. As I watched them slip away, I could only conclude that a lot of them had to get back to work the late shift -- that being the special...