Clearly this is a political decision and not one based on ethics, morals or what they would call faith. Archbishop Charles Chaput is a signatory to the so-con and far-right inspired Manhattan Declaration. His involvement is described in an oddly titled piece called, Archbishop Chaput: Manhattan Declaration will ‘galvanize’ Christians in difficult times:

“I was glad to be invited to sign the declaration, and glad to sign because I believe in its content,” Archbishop Chaput told CNA. He described it as a “straightforward” statement defending the sanctity of life, religious liberty and the definition of marriage as a union of husband and wife.

…

The Declaration’s signers want people to realize “how difficult” the present moment in U.S. history is, he added.

“Our rights and liberties are never really guaranteed by words on a piece of paper. We guarantee them ourselves, under the sovereignty of God, by struggling for what we believe.”

I detect a little bit of Teabaggery in his words.

Oh, and here’s his Facebook page.