One great thing about what is happening in Arizona is other states are keenly taking note of that successful strategy others had derided. But to many who have lead the clammering the past several years, clamping down on the employment end is key to drying up illegal entries and will in fact result in many leaving the USA on their own:
Arizona slams door on illegal immigrants - Los Angeles Times
snip from above link:
"What I love about what Arizona is doing is we don't have to rely on the federal government," said state Rep. Russell Pearce, a Mesa Republican who has authored most of the toughest measures. "It has truly woken up the rest of America that states can fix that problem." The campaign has had an effect: Illegal immigrants complain it's impossible to find good work and are leaving the state."