Arizona, with what may be the largest population of illegal immigrants in the U.S., is grappling with a state law that forces businesses to fire workers who are in the country illegally.  Arizona is on the front lines since Congress and the White House couldn’t push through a new approach to illegal immigration or guest workers, as Daniel Gonzales of the Arizona Republic reports here.  Thousands of employees, including experienced and skilled workers, are being fired before replacements can be located or trained.