From the WSJ:
Since 2008, the ratio of federal spending-to-GDP has risen by about 14%. From 2008 to 2009 we saw the greatest annual increase in spending in the last 30 years. In the name of stimulating job growth, the share of federal spending is now 24% of the economy, up from 21% in the last year of the Bush administration.
My analysis of data from 1950 to the present shows that periods with high tax-to-GDP ratios exhibit much slower economic growth than lower tax ratio periods. The GDP growth in high tax years (defined as years during which the ratio of tax-to-GDP was above 18%, the 60-year average) was about 1.5 percentage points lower than the growth rate in low-tax years...more