Whether convicted felons can vote is up to each state. All states have some process for restoring the right to vote. In New York State it happens automatically once a convicted felon's entire sentence has expired and she or he is no longer on parole, probation, or conditional release. In New Jersey, a period of time must pass (I believe 5 years, but I'm not sure) after the expiration of the sentence, unless the person successfully applies for an earlier restoration of her or his right. In Florida, the right to vote is never automatically restored. One has to apply to the state and prove that she or he has shown remorse, made restitution, and has led a productive and law abiding life. Even then, more than two-thirds of the applications are denied.