Evolving

Rand Paul mocked Barack Obama about his views on marriage "evolving".  Really?  Your views on marriage don't evolve?  Because if I still held to the beliefs that I had about marriage on the day that I got married, I would have been divorced long ago.  Of course people's beliefs evolve!  If you are in a good marriage, you understand that the only real threats to your marriage come from within the marriage, not a shadowy, mystic spectre that resides outside of the marriage.  Marriage is not a zero-sum game.  Your happiness is not dependent on the misery of others.  Rather, the more happy people you surround yourself with, the happier you are. 

So, how does gay marriage ruin my marriage exactly?