Last May, Michael Tomasky published an essay in The American Prospect, the respected liberal opinion magazine he edits, that set Washington on its ear. "Party in Search of a Notion" was Tomasky’s call for the Democrats to rise above the politics of interest-group particularism and become the party of the common good. The influential essay got front-page treatment in The New York Times and is one of the most widely quoted magazine essays of the past decade. Tomasky will discuss his ideas, his critics, and the new historical opportunity for progressive politics.