Let's put it in economic perspective. Here is a look at Revenues/GDP since 1930. (Click image to enlarge.)
The green diamond is 1950. In the era since 1950, a Rev/GDP value below 15% is atypical. The 1955 to 2005 average (green line) is 18.0%. For context, in 1950, revenues were an increasing percentage of a rapidly growing GDP. Now, revs. are a declining percentage of stagnating GDP. Big difference.
The brown line traces a 13 year average. From about 1970 on, it overlays the long average - until now. Henceforth, it will drop for years, due to an ongoing lousy economy and inadequate taxation.
I've commented before on the differences in economic performance under Dems and Rethugs. If you need a reminder, it's always better with a Dem in the white house. Here, I've traced D and R administrations in Red (Rethug) and Blue (Dem.) The pattern of revenues increasing under Dems and decreasing under Rethugs is striking and consistent. Until now, of course, with B. Hoover Obama continuing the disastrous tax cut policies of the Shrub regime. (This is actually quite unfair to the real Hoover, who raised the top tax rate from 25% to 63% in 1932, thus ending the horrible slide of the great Depression and paving the way for the New Deal.)
Here's another look at GDP growth around 1950.
From 1950 to 1960 (one decade) GDP increased by a factor of 1.9, a compounded annual growth rate of 6.625%.
Here is now.
From 1990 to 2010 (two decades) GDP increased by a factor of 2.5, a compounded annual growth rate of 4.75%. Note, this is almost 2 full percentage points lower than in the post WW II Golden Age. And to see how badly this is trending, the compounded annual growth rates for the most recent periods are 3.95% since 2000, and 3.125% for the most recent 5 years.
Here's a slightly different way of looking at it.
The five year rate of change for real GDP is expressed as a percent. The only two bright spots are the Kennedy-Johnson administration, and to a lesser extent, the Clinton administraton. Reagan's second trm numbers only look good because of the deep dive in the early 80's. Eyeball a trend line through the whole series, and we are clearly slouching toward zero growth. Make it per capital, and we'll go negative, and stay there. Data from http://www.multpl.com/us-gdp-inflation-adjusted/table