President Obama launched a vicious, underhanded attack on one of the leading contenders for the 2012 Republican presidential nomination last month: He praised former Massachusetts Gov. Mitt Romney for launching a state-administered healthcare plan. "I agree with Mitt Romney, who recently said he's proud of what he accomplished on healthcare in Massachusetts," Obama told the nation's governors. Romney supporters winced, but his potential rivals for the Republican nomination were delighted. They've already taken to calling the Massachusetts healthcare plan "Romneycare," to remind conservative voters how much it resembles the "Obamacare" law they loathe. Like the "tea party," the Obama White...