Paging Elizabeth Warren: This is your moment. In 2007, Democrats were delirious with rage about the Iraq war. Hillary Clinton, the "inevitable" presidential front-runner, had voted for the war and refused to apologize for it. Other leading candidates, including Joe Biden, John Edwards and Chris Dodd, voted for it too. This left a huge opening for a credible antiwar candidate. Barack Obama, inexperienced and underqualified, nonetheless jumped into the vacuum. The rest, as they say, is history. Today, the issue that obsesses the base of the Democratic Party is income inequality. I think that's foolish. The underlying causes of inequality...