Take a look at FY2011, page 6:
That's 13,393.1 million or 13.3 BILLION dollars. That's just the remainder after the State of Colorado subtracts its assets from liabilities.
There are 50 States. How much in total assets do you think the 50 States have? We would be approaching a trillion dollars.
This doesn't even cover the counties, municipalities, districts, agencies, bureaus, federal, etc.
This doesn't cover the various funds that each of these governments have setup for pensions, insurance, institutional funds, etc.
Take the composite, the aggregate, the sum, of all of those and where do you think we'd wind up?
Perhaps this clears things up a bit?