Why is Mitt Romney hiding his tax returns?

The answer is Mitt Romney knows his tax returns show how he used the system - albeit legally - to avoid paying fair tax rates the way middle-class Americans do.

He will look out of touch with most Americans by using tax shelters that really only apply to the super rich.

His campaign says Romney paid the same taxes whether his money was in Switzerland or the US. If that's true, then why did he deposit his money in Swiss accounts and the Caymans?

Things that make you go "hmm..."