Those words, spoken by Bill Clinton, sum up the enormous challenge facing Hillary Clinton as she tries to halt Barack Obama’s Iowa momentum in New Hampshire. Five days is a blink of an eye; ten days a languorous stroll by comparison. She needs to change the narrative, give voters in New Hampshire a reason to doubt the wisdom of giving the Democratic nomination to someone so relatively untested as Obama. But this will be hard to do. Obama is riding a wave right now, and his message — of hope and change and a new kind of politics — suits the independent-minded New Hampshire voter. Tomorrow night’s debate might be her last, best shot.