WHAT EVIDENCE IS THERE OF THE IMPACT OF SAME-SEX MARRIAGE?:  It’s an interesting question, given the relative newness of same-sex marriage.  Nelson Lund explores this in a WSJ op-ed.  Of course, as posted earlier, many–especially libertarians– argue that there should be  a “presumption of liberty,” and the government, not individual citizens, should have to prove that same-sex marriage harms children or society before exercising the power to ban such marriages.