What's wrong with 'gay marriage'?

Michael Novak, "Defining Marriage Down" (The Catholic Thing, October 21, 2008):

A question posed by Bill O’Reilly has been nagging at me for a couple of weeks: “What is wrong with gay marriage?” None of his on-air guests had given him reasons...."

Read the rest of Novak's fine analysis (linked above).

[Hat tip to E.E.]