Fledgling Republican presidential candidate Rick Santorum has been using bizarre analogies to explain his opposition to gay marriage. At a recent campaign event Santorum said, "I can call this napkin a paper towel, but it is a napkin. Why? Because it is what it is. Right?" Jon Stewart did his best to explain Santorum's logic, saying he's making a slippery slope argument: "If people start using paper towels as napkins, what's next? Sleeves?! Drapes?!" But it's not just well-known anti-gay marriage politicians "defending" marriage. Jon points out that while the Obama administration calls the Defense of Marriage Act "indefensible," Obama's still enforcing it with sometimes cruel results. Watch the clip to see for yourself.