@Setanta,
Cain claimed to be a businessman, but he has no clue about the supply of gold, and the total value of what just the US holds vs other countries.
Here's some of the gold holders: US 8965 tonnes, Germany 3749 tonnes, IMF 3137 tonnes, Italy 2702 tonnes, China 1161 tonnes, France 2684 tonnes.
That's equivalent to about 22,400 tonnes, or put another way, the total value at current gold prices equals over $1 trillion dollars.
There isn't that much US currency in circulation around the world. The value of the gold in US is valued at over $444.6 billion.
Total US currency in circulation is $853 billion.
As a matter of supply and demand on gold, there's no way to cash out all the gold now available.