The State Senate approved a ballot question asking voters to consider a constitutional amendment that would allow felons to vote after they finish their prison terms. The measure, approved 27 to 8, will put the amendment on the ballot in November 2006. Now, as in many other states, former felons in Rhode Island may vote only after completing their probation and parole. Thirteen states and the District of Columbia allow felons to vote while on parole or probation; four others, including New York, allow them to vote while on probation, and Maine and Vermont extend the vote to prisoners as well.