I'm afraid you're the one who has no idea what you're talking about. Felons are barred from all sorts of things under various state laws, Barred from running for office, barred from applying for state contracts, barred from serving on juries. Laws vary state to state, but all states except Vermont (and apparently Maine) have some form of felon disenfranchisement for voting.
Well duh, no incarcerated felon should have the right to vote while they’re in prison just like none have a right to a firearm while they’re in prison.
Still its a nice progressive argument shift you have going on there.