His Eminence Timothy Cardinal Dolan gave the Benediction Prayer at the close of the Democratic National Convention in Charlotte, NC.
Here’s the part regarding marriage:
"We praise and thank you for granting us the life and the liberty by which we can pursue happiness. Show us anew that happiness is found only in respecting the laws of nature and of nature’s God. Empower us with your grace so that we might resist the temptation to replace the moral law with idols of our own making, or to remake those institutions you have given us for the nurturing of life and community."
In other words: Resist the temptation to remake marriage.
For the complete text, see Cardinal Dolan’s blog.
To compare this benediction with the one at the Republican convention, check out CatholicVote.