WASHINGTON - Barack Obama has been saying that Americans are doing a lot better than they were before he was sworn into office in 2009. It's a claim he's been repeating everywhere he goes, at party fundraising events and in nearly every interview he's had in recent months. "There's almost no economic measure by which we are not better off now than we were when I took office," he told Democrats earlier this month at a campaign fundraiser in Dallas. "We are indisputably better than when I was elected," he says. It's a fundamentally specious, slippery and exaggerated claim that...