President Obama taken criticism for the negative tone of his 2012 campaign. In 2007, then Senator Obama said he hired oppo researchers for his campaign "to make sure that we know the records of all the candidates well enough that we can compare and contrast where we stand on issues and where others stand on issues, and that I think is essential to democracy – I don't think there’s anything wrong with that at all." But it is hard to see how Mitt Romney's singing voice fits into that frame.
