In the US the very wealthy pay a disproportionate fraction of taxes, relative to the income they earn.
http://taxfoundation.org/article/new-data-top-1-pay-greater-...
http://i.imgur.com/wa8uu.png (A graph of the data)
The US actually has a more progressive tax system than any other OECD nation - only Ireland and Australia even come close.
http://taxfoundation.org/blog/no-country-leans-upper-income-...
Given that the poor and middle class consume disproportionate amounts of government services (primarily redistribution), while the wealthy pay a disproportionate amount of taxes, it's an untenable position that the wealthy don't pay their fair share.