The US Bishops are approaching questions of marriage and family life in a number of ways, a sample of which can be found here, here and here.
In today's statement, the Bishops write:
Especially in our society where we see so many marriages fail, we should work to strengthen marriage rather than redefine it.The Catholic Church teaches that marriage is the faithful commitment of one man and one woman: for better, for worse, for richer for poorer, in sickness and in health - until death. Even the casual observer sees that social acceptance of civil divorce and a growing misunderstanding of the Church's annulment process as "Catholic divorce" may already have largely redefined marriage in the popular imagination.
The US bishops have their work cut out for them as they meet later this month with an agenda including a draft of their proposed pastoral letter: Marriage: Life and Love in the Divine Plan.
(The only available link to the text of the draft is found near the close of an article from NCR.)