Tax revenue as a portion of GDP in Canada is in the range of 30% to 32% of GDP, and in the United States it is 24% to 26% of GDP ( http://en.wikipedia.org/wiki/List_of_countries_by_tax_revenue_as_percentage_of_GDP ), meaning that the American government collects 6% less tax than the Canadian government. At the same time, government spending in Canada and the USA are roughly equal with Canadian's spending 39.7% GDP and Americans spending 38.9% GDP ( http://en.wikipedia.org/wiki/Government_spending ) ...
When you factor in the difference in services received, for example Canadians get healthcare and a better education system, it should be clear that the US government is spending far more than the Canadian government to deliver less services at a lower quality; and it becomes a reasonable argument that the Government of the USA is collecting enough revenue for the services it provides and is simply spending too much money to provide those services.
