"I'm not concerned about the very poor"... "I'm not looking for a colony on the moon"... "My dog is on the roof, my dog is on the roof." Mitt Romney gets skewered by YouTube regular Hugh Atkin, with the help of rapper Eminem's The Real Slim Shady.

This is video and soundtrack mash-up at its cruellest – but it tells some important truths about the candidate and the rodeo that is this Republican primary. Going viral... now: