When the Obama administration last week announced its intention to review the cases of 300,000 immigrants ensnared in the nation's deportation process, as well as to institute new guidelines going forward -- with the goal of distinguishing between those who pose threats to public safety from those who are merely in the country illegally -- reaction reverberated along well-worn lines. Enforcement hawks denounced the move as amnesty; immigration doves responded warily, worried that it would substitute for more comprehensive efforts to fix the nation's broken immigration system.