George Soros told a carefully vetted gathering of 70 likeminded millionaires and billionaires last weekend that they must be patient if they want to realize long-term political and ideological yields from an expected massive investment in “startup” progressive think tanks. The Scottsdale, Ariz., meeting, called to start the process of building an ideas production line for liberal politicians, began what organizers hope will be a long dialogue with the “partners,” many from the high-tech industry. Participants have begun to refer to themselves as the Phoenix Group. Rob Stein, a veteran of President Bill Clinton’s Commerce Department and of New York...