Members of the Democratic Leadership Council meet in Tennessee this weekend and the man who rode their sensible ideas right into the White House, Bill Clinton, will be there. So will 300 current officeholders from around the country. But guess who won’t? Well, for starters, one Hillary Rodham Clinton. She’ll be in South Carolina, then home to Chappaqua on Sunday. And Barack Obama, why he’s scheduled to be in Iowa and then home to Chicago for most of the weekend. Not John Edwards either or even any of the second-tier candidates like New Mexico Gov. Bill Richardson. In fact, not...