When in the course of human events it becomes necessary for one people to dissolve the political bands which have connected them with another, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation. Unfortunately, no one seems to have told former Starbucks CEO Howard Schultz. Schultz, a lifelong Democrat and a billionaire who contends the party has strayed too far left, has declared that he may enter the presidential race as a “centrist independent.” But at an event Monday night to promote his new memoir at a Barnes & Noble in Manhattan, he failed to convincingly answer the most important question: why? The fourth floor of the bookstore, which includes a Starbucks, was an unusual place for what amounted to a campaign kickoff—the first public event Schultz held since teasing his bid on CBS’s 60 Minutes.