The American Civil Rights Union ("ACRU") challenges the Philadelphia City Commissioners' failure to purge the city's voter rolls of registered voters who are currently incarcerated due to a felony conviction. Because state law prohibits felons from voting while they are in prison, the ACRU argues that the National Voter Registration Act requires the Commissioners to remove them from the voter rolls. For the reasons that follow, we will affirm the District Court's dismissal of this suit.