Mandatory spending is more then Social Security, Medicare, and interest on the debt.
Mandatory spending includes 
SNAP, unemployment compensation, and earned income and child tax credits Veterans benefits Medicaid and Obamacare, and more. That's over 60% of the federal budget.
 
Money for jobs and infrastructure doesn't have to come from borrowing unless the government is the one to build it. There are about $30 billion worth of pipeline projects, that will be paid for by private business, awaiting approval. 
 
Why would we want the government to build a high speed (200+ MPH) rail from coast to coast, for hundreds of billions of dollars, when you can get on a plane and travel at over 500+ MPH at a fraction of the cost ?
 
And if you print a trillion one dollar bills a second, you would have enough to pay off the debt in 17 seconds.
		
 
 
Operating on continuing resolutions obscures the budget and legislation. This is the best info one can get for the last 3 years (2010 to 2012) The only true mandatory spending is interest on the debt and paying creditors which social security and medicare recipients or others are not. Citizens are unsecured creditors...
 
2010
Total revenue
  $2.381 trillion 
(requested)
$2.163 trillion 
(actual)[1]
Total expenditures
  $3.552 trillion 
(requested)
$3.456 trillion 
(actual)[1]
  $1.171 trillion 
(requested)
$1.293 trillion 
(enacted)[1]
Debt
  $14.078 trillion 
(requested)
Website
http://www.gpoaccess.gov/usbudget/fy10/index.html US Government Printing Office
 
2011
Total revenue
  $2.567 trillion 
(requested)[1]
$2.303 trillion 
(actual)[2]
Total expenditures
  $3.834 trillion 
(requested)[1]
$3.603 trillion 
(actual)[2]
  $1.645 trillion 
(requested)
10.9% of GDP
$1.30 trillion 
(actual)[2]
8.7% of GDP
Website
  http://thomas.loc.gov/home/approp/app11.html Library of Congress
 
2012
Total revenue
  $2.627 trillion 
(requested)
$2.449 trillion 
(actual)[1]
Total expenditures
  $3.729 trillion 
(requested)
$3.538 trillion 
(actual)[1]
  $1.101 trillion 
(requested)
7.0% of GDP
$1.089 trillion 
(actual)[1]
7.0% of GDP
Website
  US Government Printing Office
 
Total outlays by budget "function" 2012
Function  Title  Requested
[46]  Republican
proposal
[43]  Enacted
[47]
050 
National Defense
  $737.537 billion  $712 billion  $716.300 billion
150 
International Affairs
  $63.001 billion  $36 billion  $56.252 billion
250 
General Science, Space and Technology
  $32.284 billion  $30 billion  $30.991 billion
270 
Energy
  $23.411 billion  $16 billion  $23.270 billion
300 
Natural Resources and Environment
  $42.703 billion  $37 billion  $42.829 billion
350 
Agriculture
  $18.929 billion  $20 billion  $19.173 billion
370 
Commerce and Housing Credit
  $11.69 billion  $17 billion  $79.624 billion
400 
Transportation
  $104.854 billion  $80 billion  $102.552 billion
450 
Community and Regional Development
  $25.701 billion  $24 billion  $31.685 billion
500 
Education, Training, Employment and Social Services
  $106.172 billion  $100 billion  $139.212 billion
550 
Health
  $373.774 billion  $347 billion  $361.625 billion
570 
Medicare
  $492.316 billion  $482 billion  $484.486 billion
600 
Income Security
  $554.332 billion  $501 billion  $579.578 billion
650 
Social Security
  $767.019 billion  $766 billion  $778.574 billion
700 
Veterans Benefits and Services
  $124.659 billion  $127 billion  $129.605 billion
750 
Administration of Justice
  $58.696 billion  $ 54 billion  $62.016 billion
800 
General Government
  $31.149 billion  $27 billion  $31.763 billion
900 
Net Interest
  $241.598 billion  $256 billion  
$224.784 billion
920 
Allowances
  $6.566 billion  $-3 billion  $0.125 billion
950 
Undistributed Offsetting Receipts
  $-99.635 billion  $-100 billion  $-98.897 billion
  
Total
  $3728.686 billion  $3529 billion  $3795.547 billion
 
 When the interest rates rise, it will explode the national debt. If the debt stayed were it is now, every 1% rise in the ten year treasury would add an estimated 170 billion annually to interest payments. The market uses the 10 year as a average between other notes and T-bills (i.e. short term / long term) All one has to do is watch the 10 year treasury to know when the crunch is coming. Politically, the government will only touch Social Security / medicare when they have no other option. Social security can be fixed tomorrow by raising the age you can collect to the average age when people die. But that exposes the program for what it is, a tax...It is a ponzi in the true meaning of the term. Ponzi schemes do well as long as you have more people paying in then taking out...Baby boomer retirements are going to expose the ponzi scheme..
 
Currently, the government has overspent 17 trillion dollars...Do you feel you have gotten 17 trillion dollars worth of service?
 
Printing a one dollar bill every second would take you 30, 000 plus years to print a trillion dollars...one trillion seconds ago was 27,900 BC.
 
The government is not going to approve the pipeline under the current administration unless some compromise is made. Compromise just means some special interest or political agenda just received allot of money...Politicians do not do what is in the best interest of the country..The 17 trillion in debt demonstrates my point...