Since Arizona passed SB 1070 in 2010, five other states signed similar legislation into law: Alabama, Georgia, South Carolina, Utah and Indiana. Some of those laws are on hold pending court rulings, but lawmakers in say they've already seen successes, as well as unforeseen consequences.

CAMBRIDGE, Mass. -- A coalition of groups supporting immigrants has recruited teams of volunteers to help push programs they hope will add thousands of new U.S. citizens to the voter rolls in several states in time for the November presidential election.