A Look at the Future of Abortion From Colorado

With a newly expanded conservative majority on the Supreme Court, state-level fights over abortion have taken on even more significance: They’re a preview of what might happen if the justices grant more latitude to states to determine abortion restrictions. On Tuesday, by a margin of more than half a million votes, Colorado voters firmly rejected a proposition that would have limited abortion more than 22 weeks into a pregnancy.

This decision has significant practical consequences: Colorado is one of only seven states that permits abortion at any point in pregnancy,...