Sweet P Farm is nestled at the top of a winding driveway, hidden from view by 77 acres of gentle woods and meadows, a retreat in the Berkshires where Governor Deval Patrick can swat a few tennis balls on his private court, work on a chapter of his memoir, or stroll through the wildflowers in his backyard. But during this year's high summer season, Patrick is opening his rural getaway to the Massachusetts political world, transforming it into something like the state's own version of Camp David. The governor hosted a big ticket fund-raiser at the home last week that...