A very large amount of money goes to paying the interest on the national debt. Several billion dollars actually. If I can pass an amendment to not allow the US government to build up debt, the interest that goes to the debt should go to me for one year. They'd really be saving themselves a lot of money.
According to
this site the national debt is about 8.5 Trillion.
According to
this site (popup warning) the current 90-day t-bill rate (the lowest rate the government pays) is 4.95%.
As of today, that's $420 billion a year, more than $1B per day just in interest. This doesn't take into account the $2.5 billion per day increase in the debt, or the higher rates from longer-term debt instruments.
You'd be richer than Bill Gates by the end of February of that year.