So what explains the crazy, cockeyed optimism of House Democrats? Maybe they still believe Team Obama’s rosy-scenario forecast that shows the stimulus package a) keeping unemployment under 8 percent this year and b) launching an economic boom next year and beyond. For some reason, though, they think the battered U.S. economy is so strong that politicians can pile tax upon tax on it with no fear of further harm. Less than three weeks after passing a costly cap-and-trade carbon emission plan, Pelosi & Co. have giddily unveiled a $1.2 trillion healthcare plan partially funded by a $544 billion surtax on...