These moonlighting American presidents. There’s Abraham Lincoln, vampire hunter. And now we find Barack Obama, pop singer. He’s been hitting a rough patch on the political side lately, but he’s at least hitting some right notes on these spliced-up pop song mashups by an enterprising YouTube user who’s also hawking tees along with the laughs. So, how does Obama fare? He totally kills Call Me Maybe, is semi-convincing for Sexy And I Know It, but totally flops when it comes to channeling his inner pop diva for Born This Way and Drink To That.