A right and I'm not entirely sure why convicted criminals shouldn't vote. What are they going to do, vote in someone that will legalize all crime?
I agree that at a conclusion of a sentece, depending on the crime, ex-criminals should be allowed to vote (if a 22-year-old was arrested for carrying cannabis that shouldn't stop them from voting 50 years later - on the other hand, a convicted murderer should be forever prohibited from voting). But during their sentece, they shouldn't be treated the same as everyone else - they still committed a crime, and that shouldn't be ignored or minimized. They're in jail, and that should be taken seriously. People in jail should, for the time of their sentence, be treated differently from others. It's not necessarily a question of what practical effect it would have, but a moral question of whether or not someone convicted of wrongdoing should be allowed to exercise voting rights during their punishment. If you keep on expanding rights for people in jail, then you're minimizing the effect of their sentence. It's not supposed to be fair - it's supposed to disincentivize the person from committing a crime again. Of course, the right takes it too far by wanting to keep ex-felons from voting ever again.