The grand total of the combined net worth of every single one of America's billionaires is roughly $1.3 trillion. It does indeed sound like a "ton of cash" until one considers that the 2011 deficit alone is $1.6 trillion. So, if the government were to simply confiscate the entire net worth of all of America's billionaires, we'd still be $300 billion short of making up this year’s deficit.
That's before we even get to dealing with the long-term debt of $14 trillion, which if you're keeping score at home, is between 10 to 14 times the entire net worth of all of the country's billionaires, combined. That includes the all-powerful Koch brothers ($40 billion between them), the all-powerful George Soros ($14.5 billion), all the Walton family (of the Wal-Mart fortune), Steve Jobs, Oprah (at a paltry $2.7 billion), the Google Founders, Michael Bloomberg, and the Mars family (of the candy bar empire).