Montana and Arizona are set to vote on enshrining the right to abortion in their state constitutions, with both states facing citizen-sponsored questions on their ballots. In Montana, a coalition of abortion rights groups collected enough signatures to place the measure on the ballot, while in Arizona, the state's Supreme Court rejected an appeal from anti-abortion groups trying to strike a similar measure. National Democrats and abortion rights groups are investing in these measures to drive turnout and support Democratic candidates in the Senate. The Montana measure aims to prevent future court members from reversing the state Supreme Court decision that legalized abortion until viability. Despite attempts by Republican officials to block the amendment, polls show a majority of Montana residents support legal abortion. The article also highlights previous ballot measures and the ongoing efforts of abortion rights groups to protect reproductive rights.