The Clinton line, an elaboration of Obama excuse No. 37 for the dismal economy (after the Arab Spring, ATMs, the euro crisis and tomato blight in Mrs. Obama's White House garden), goes like this: The economy was so damaged by George W. Bush-era policies that "no president" could have been expected to do better than the record-high poverty, staggering unemployment, shrinking workforce participation, anemic growth and gargantuan debt over which Barack Obama has presided. We're asked to believe that the Obama administration knew all along that things would take longer than four years to improve. "I never said this journey...