WASHINGTON – Over the years, presidential downtime has fleshed out the image of the man - whether it be clearing brush (Reagan and Bush II) or speed-boating (Bush I) or hunting (Teddy Roosevelt). All presidents need to show the public they're not captured by work, and that they know how to recharge their batteries. But what about presidential- candidate downtime? As Democratic standard-bearer John Kerry relaxes at his home in Ketchum, Idaho, there's a calculation at work that he can vanish from public view for five days without the Bush campaign filling the void with the definitive (read: negative) take...