Voters in one of the most conservative U.S. states will decide whether to roll back the state's abortion ban. Idaho officials informed supporters Monday that the measure would be added to the ballot. That makes it the fourth state where voters will directly decide abortion policy in November. In Missouri, a proposal would undo an amendment adopted two years ago that allowed abortion. In Nevada and Virginia, measures before voters would enshrine abortion rights in the state constitutions. Both places already allow abortion through at least 24 weeks of pregnancy. Abortion rights groups have prevailed in most ballot measure votes over the last four years.