In the March 21, 2004 Washington Post, Gene Weingarten wrote a very good column, with his tongue firmly in his cheek, explaining why we need a Constitutional amendment against gay marriage. It's amusing and worth reading. I'll respect the Post's copyright and not copy it here, but I can't resist repeating the additional amendment Weingarten recommends:

But if we do follow this path, we really ought to consider another constitutional amendment, drawing not only from this same intense desire to improve our society, but from our increasing willingness to invoke the deity to do so:
Proposed Amendment XXVIII:
"It shall be unlawful to use the U.S. Constitution as a plaything for the politically self-righteous. Violators should all go to Hell."