5.8 million Americans can't vote because of their criminal records [View all]
Most states prohibit people from voting while in prison for a felony. Even if someone isn't physically incarcerated, if they're serving a criminal sentence for a felony conviction, they're probably not allowed to vote. Twelve states make it illegal for some people with felony convictions to vote even after they've finished their sentences.
As a result, according to the Sentencing Project, 5.8 million American citizens have lost their voting rights through the criminal-justice system. And one in every thirteen African-American citizens has lost his or her right to vote this way.
This map, compiled by the Sentencing Project based on 2012 data, shows which states have disenfranchised the biggest shares of their electorates:
The map shows that just disenfranchising people who are currently serving sentences for felonies doesn't have nearly as much of an effect on the electorate as disenfranchising people after they've finished their sentences. All but two states Maine and Vermont make it illegal for people to vote from prison if they've been convicted of felonies. Thirty-five states prohibit people from voting if they're on parole after being released from prison, and 31 make it illegal for people to vote who are on probation for a crime (even though they may not have gone to prison at all).
map at link, plus more:
http://www.vox.com/2014/10/5/6906875/state-prisoner-voting-law-felon-disenfranchisement-map-virginia