Detroit

In Rahm Emanuel's telling, the Democratic victories on Tuesday were a continuum of what began in the 2006 midterm elections, when his party won majorities in the House and the Senate for the first time in 12 years. "After 2006, I said it was George Bush and the desire for change," the congressman from Chicago's North Side tells me. "And the same cocktail contributed to this turnout. You had Barack Obama's message of change and Bush and the Republicans' record of incompetence."

Mr....