BY FROMA HARROP The weekend’s memorable photo is of Mitt Romney driving his massive powerboat past a privately built castle, not unlike his own, on New Hampshire’s Lake Winnipesaukee. On Sunday, he moseyed across the Long Island Sound to the beachy pleasure dome of billionaire conservative David Koch, in Southampton, NY – for a $75,000-a-couple dinner to raise money from like-minded Republicans. Not far away, Koch’s brother Bill, a fellow funder of conservative causes, holds […]