From the NY Times:
In the United States, only citizens are allowed to vote in national and statewide elections. And while immigrants who are granted permanent residency — a green card — enjoy an array of privileges, including the right to work, they can lose them all and be expelled from the country if the authorities discover that they have even registered to vote.
Uncovering an immigrant’s voting history is not always hard. Many proudly acknowledge having voted when applying for American citizenship.
Officials with United States Citizenship and Immigration Services, which processes immigrants’ visas and naturalization petitions, say the agency does not keep records of how many noncitizens have been caught violating voting laws. Many election law experts said there was no evidence that the violations happened frequently — or at least enough to skew election results.
No group appears to have made the issue a central cause this election season, Mr. von Spakovsky said, but that could change if some results in crucial races are close. “That’s when people will potentially pay attention," he said.
William G. Wright, a spokesman for Citizenship and Immigration Services, said the agency did not provide “specific information on voting rights” when granting green cards. But he pointed out that voter registration forms explain that an applicant must be an American citizen.