Wrong.
1. There is no Federal Law restricting the voting rights of convicted felons. Elections are left to the state so the law is different in every state. Some states have no laws restricting the voting rights of convicted felons, some do, while others say only parolees cannot vote. Understand?
2. Laws that seek to disenfranchise voters convicted of a felony scare the Hell out of me for one simple reason. You want to get rid of your political opposition? Make something a felony. Charge and convict the opposition and they can never vote against you again.