If he did know about Snooki, then people would react by saying “WTF is this guy doing watching MTV when he should be running the country”. Honestly guys, it was probably his speech writers that threw in the bit about Snooki to make Obama sound funny and cool. You don’t expect any President of the US to keep up with the TV shows.
He’s not just “any” president. He’s an idiot and he is the most media driven, vacation taking, knowledge-free person who has ever been anywhere near the Oval Office.
I would suspect he knows perfectly well who Snooki is. And if he doesn’t and was just reading it, as you imply, wouldn’t it have occurred to him to ask?
Remember when he said he didn’t know what an ipod was?