The federal government still has $100 billion to $150 billion in stimulus money left to spend. That’s about as much as the Making Work Pay tax credit that gave $800 apiece to middle-class families in 2009 and 2010. And it’s twice as much as Congress gave to states to stabilize budgets and save education jobs. So, could the money be better used to counteract the fallout from the European debt crisis and Standard & Poor’s downgrade of the U.S. credit rating?