PROPOSITION 200, an Arizona ballot initiative aimed at illegal immigrants, would seem to have little going for it. Virtually the entire political, business and religious establishment of the state--including Democratic Governor Janet Napolitano, Republican Senator John McCain and the state's three Catholic bishops--is lined up against it. The Arizona Chamber of Commerce is also campaigning for its defeat. But such is the backlash against the flood of undocumented Mexicans pouring over the border that the "Protect Arizona Now" initiative seems almost a sure bet to pass.
The proposition requires voters to show a valid ID at the polls and makes it...