Budget Surplus President Clinton had new evidence today that the country's economic boom is still going strong. The White House announced it had doubled its estimate of the size of the looming federal budget surplus. Instead of a Trillion dollars over the next 10 years, the excess of revenues over spending may be closer to Two Trillion. That's got politicians in both parties brimming with ideas about how to use that money, or return it to taxpayers. NPR's White House Correspondent Mara Liasson reports.