In November, Missouri voters will get to decide whether two Supreme Court justices will keep their seats. Some progressives want to vote against retaining them because of their opinions on an abortion rights amendment — but it could backfire.

After a Missouri Supreme Court decision, Missourians will be able to vote in November on an amendment that would enshrine abortion-rights protections in the state's constitution. The language on the ballot will be as follows: "Do you want to amend the ...