In the United States, your assertion that "working stiffs" are burdened with most of the taxes is not supported by the facts. If you look at total taxes paid (local, state, and Federal) as a percentage of income, the bottom 40% are taxed at about 20% and the top 20% are taxed at about 30% (Washington Post). So the rich are paying taxes at a higher rate then the "working stiffs."
If you look at it from the "income to the Federal government" perspective, as of tax year 2011, the top 5% paid 57% of the collected income tax and the bottom 50% paid 12% of the collected income tax.
Based on those two facts, I assert that the "working stiffs" are not taxed at a higher rate then the rich. Also, at the Federal level, the rich pay far more in taxes. Where the "working stiffs" lose out (and the Washington Post article shows this) is at the local and state level.