His taking his money out of the U.S., his reticence to talk about how he got his money, his reticence on revealing his tax returns during those years when outsourcing got popular, his shaping of a company culture that continued after he resigned as the sole share-holder and head of Bain Capital, his flip-flopping...hell no, not flip-flopping...his hypocrisy with more than just footwear, his attitude toward women which is also part of his personal culture, the racist nature of the background he comes from when linked to his astonishing remark about Anglo Saxons....
....and that's all I can think of off the top of my head at the moment.
The average voter might be excused if they doubt that any of those items have anything to do with them. How many jobs will be created by Mitt releasing more tax returns?