538:

In a March 2018 poll for HuffPost, YouGov found that 24 percent of U.S. adults supported restoring felons’ voting rights while they are in prison and 58 percent opposed it, including 41 percent who were “strongly” opposed….

But the public is more likely to support restoring the right to vote for felons who have been released from prison, even if they are on probation or parole — 38 percent of adults supported the idea in the HuffPost/YouGov poll, while 44 percent were opposed….

[T]he easiest proposal to pass might be one that simply returns the ballot to felons after they have completed all parts of their sentence, as a plurality of states currently do…. [C]rucially, it is downright popular as a policy: 63 percent of adults told HuffPost/YouGov that they supported restoring the vote to felons who had completed their sentences. Just 20 percent were opposed.