The rich don't owe more taxes simply because they have more. That's the big lie that Obama has been able to sell because so many Americans don't think;because they don't know how and they wouldn't be bothered to if they did.
Taxes are nothing more than the price we pay to have government, so there is no reason for anyone to pay more taxes than anyone else-unless, of course, they use more of government services; like the poor, for example.
You might as well say that the the rich should pay more for a loaf of bread or a gallon of gas just because they can afford to!
Which leads us to the question; should those who don't contribute anything be allowed to have a say in what is done with the money?