So let's get busy! And, of course, let's remember to vote.
The bishops quote both Pope Benedict XVI and the Catechism of the Catholic Church:
"Only the rock of complete and irrevocable love between man and woman is capable of acting as a foundation for a society that can be home to all human beings."—Pope Benedict XVI, addressing the John Paul II Institute for Studies on Marriage and the Family, May 11, 2006
God himself is the author of marriage. The vocation to marriage is written in the very nature of man and woman as they came from the hand of the Creator. Marriage is not a purely human institution despite the many variations it may have undergone through the centuries in different cultures, social structures, and spiritual attitudes. The well-being of the individual person and of both human and Christian society is closely bound up with the healthy state of conjugal and family life. -- Catechism of the Catholic Church, 1603, 1604