Jonathan Rauch has a superb column in Reason on the proposed Marriage Protection Act. A crucial paragraph:
Two questions for anti-gay-marriage, anti-abortion Republicans: If states can be allowed to go their own way in defining human life, why not allow them to go their own way in defining marriage? Where constitutional amendments are concerned, why is preventing gay couples from marrying so much more urgent than preventing unborn children from being killed?
Who ever said politicians were supposed to be consistent.