If Pres. Bush doesn't support stopping this slide into Sodomite Hell via a Constitutional amendment, he doesn't deserve to be President, and say hello to Pres. Kerry.The president has absolutely no Constitutional role to play in this issue at all. The president may not propose a Constitutional amendment (unlike other legislation), nor is his signature required anywhere in the process of ratification.
To the extent that this is a federal issue, it will first be played out at the Supreme Court, and then, ultimately in Congress.
Presidential support for a Constitutional amendment can have a big impact on whether it gets enacted.
I expect the President to make his support for an amendment clear and soon.
Bush can use the bully pulpit and twist arms in Congress to get the process toward a Constitutional Ammendment started.