IS IT FINALLY TIME to declare a state of emergency in the city of Philadelphia - including calling in the National Guard? The bloody evidence is mounting that yes, it finally might be time. Yesterday, within 21 minutes - less time than it would take to watch your average sitcom - three people were shot dead in the streets of Philadelphia, including a cabbie who wanted nothing more than to fill his tank with gas. This, after a weekend of carnage that included at least six homicides. We are well past matching last year's killing numbers at this point. How...