TO BALANCED-BUDGET believers, the first big mistake George W. Bush made as president was not vetoing the 2002 farm bill. Not only did Bush sign the bill, but he also didn't try to stop Congress from larding the bill with corporate welfare -- which is like handing the car keys and a six-pack to a drunk driver on parole. The result -- a farm-subsidy package that cost the average American household some $1,800 over 10 years, according to the Heritage Foundation. Now Bush is trying to atone. In his new budget, the White House has proposed a 5 percent cut...