Opponents of Arizona's law see it as an attack on vulnerable voter groups such as minorities, immigrants and the elderly. They say they've counted more than 31,000 potentially legal voters in Arizona who easily could have registered before Proposition 200 but were blocked initially by the law in the 20 months after it passed in 2004. They say about 20 percent of those thwarted were Latino.
Barbara Arnwine, president and executive director of the Lawyers' Committee for Civil Rights Under Law, called the decision a victory. "The court has reaffirmed the essential American right to register to vote for federal election without the burdens of state voter suppression measures," she said.
But Arizona officials say they should be able to pass laws to stop illegal immigrants and other noncitizens from getting on their voting rolls. The Arizona voting law was part of a package that also denied some government benefits to illegal immigrants and required Arizonans to show identification before voting.
The federal "motor voter" law, enacted in 1993 to expand voter registration, requires states to offer voter registration when a resident applies for a driver's license or certain benefits. Another provision of that law -- the one at issue before the court -- requires states to allow would-be voters to fill out mail-in registration cards and swear they are citizens under penalty of perjury, but it doesn't require them to show proof. Under Proposition 200, Arizona officials require an Arizona driver's license issued after 1996, a U.S. birth certificate, a passport or other similar document, or the state will reject the federal registration application form.
While the court was clear in stating that states cannot add additional identification requirements to the federal forms on their own, it was also clear that the same actions can be taken by state governments if they get the approval of the federal government and the federal courts.
Arizona can ask the federal government to include the extra documents as a state-specific requirement, Scalia said, and take any decision made by the government on that request back to court. Other states have already done so, Scalia said.
The Election Assistance Commission "recently approved a state-specific instruction for Louisiana requiring applicants who lack a Louisiana driver's license, ID card or Social Security number to attach additional documentation to the completed federal form," Scalia said.
Currently, the Election Assistance Commission doesn't have any active commissioners. The four commissioners are supposed to be nominated by the president and confirmed by the Senate. The last two commissioners, Donetta L. Davidson and Gineen Bresso, left in 2011, according to the EAC website.
"The notion that the court will not enforce the Constitution unless you first apply to a commission that cannot act because it has no members is mind boggling," Caso said.
Voting rights advocates immediately called on future EAC commissioners to reject any requests to add identification documents to the federal voter registration form.
"Federal law already provides enough protection, and states should not be unduly burdening eligible citizens who want to register to vote," Advancement Project Co-Director Penda D. Hair said.
The case is 12-71, Arizona v. Inter Tribal Council of Arizona, Inc.