Both Rick Perry and Michelle Bachmann have suggested that the poor need to pay more in taxes. They say this because they believe 50% of Americans do not pay taxes. Let's break that down.
They get this figure from federal income taxes - 50% of adults are not paying any income tax. But this is because many Americans are retired, unemployed, or so under the poverty line that their income is cancelled out by tax credits. Still, most of these pay many other taxes, including...
State Income Taxes
Gasoline Taxes passed on to the consumer
"Sin" Taxes on items like alcohol and tobacco
Property Taxes (Home, Car, ect)
Social Security Deductions
Worker's Compensation Deductions
Mandatory Pension Contributions
Special taxes based on phone and internet use
Tolls, Tickets, and Fares for use of Public Transportation and Public Roads and Bridges
Taxes and Fees for Air Travel such as "9/11 Security Fee"
Depending on the individual and the state, these can add up thousands of dollars per person per year.
No taxes my ass.