John McCainAnnouncing the John McCain Presidential Campaign Countdown Contest, which is being brought to you exclusively by this very blog, Checking In, at www.evtrib.com.Two factors prompted the contest:1) While filming a Friday episode of the local PBS talk show program Horizon recently, guest host Howard Fisher of Capitol Media Service asked the panelists an intriguing question: When do you think Sen. John McCain will end his 2008 presidential campaign?2) I seem to have collected a few political odds and ends that would make a suitable contest prize, McCain