It was hard for the Democrats to get the 219 votes they needed to pass the "cap and trade" climate change bill in the U.S. House two weeks ago. Speaker Nancy Pelosi, a California Democrat, may have rolled the dice but, veteran Capitol Hillers say, it was only the intervention of President Barack Obama and White House Chief of Staff Rahm Emanuel that managed to close the deal. They did it by pitching the vote as a referendum, at least internally, on Obama's presidency rather than on the underlying issue. No president likes to lose, least of all on a...