First, I don't think Paul is a significant factor in gold prices. People may be cheering for him but IEM still has "Other" (including Paul) trading at 1.3 cents for a $1 payout. http://iemweb.biz.uiowa.edu/quotes/Nomination08_quotes.html His odds are slim, to say the least.
Second, if he was a big factor, wouldn't a Paul presidency lead to skyrocketing gold prices, as there would be bigger demand for gold as money?