Like many Americans, I once thought that Social Security was some separate trust fund that was immune from political raids. A few years ago, a government economist assured me that there was absolutely nothing set aside in Social Security. It had been borrowed long ago- stolen. Replaced by IOU's.
Unbelievably, the vast majority of people don't know this. This article will help you understand. http://blogs.forbes.com/merrillmatthews/2011/07/13/what-happened-to-the-2-6-trillion-social-security-trust-fund/