When a measure appears on a ballot that is positively for the promotion or legalization of abortion, Catholics have a very clear example to follow in St. John Paul II.
St. John Paul II wrote extensively about life issues in his encyclical, Evangelium Vitae, and states clearly what the Church believes when it comes to voting for pro-abortion laws.
If a ballot measure is proposed that seeks to legalize abortion, a Catholic, according to St. John Paul II, must vote against it.
There are cases when laws are proposed that seek to limit abortion, and even if they don't fully outlaw abortion, St. John Paul II believed a Catholic could vote for such laws.
St. John Paul II firmly believed that abortion should have no place in civil society and that Catholics are called to be witnesses of hope in the world, supporting women and children in any way that they can.