Nearly a month ago, Attorney General Martha Coakley, leading in the polls by a comfortable 30 points, seemed to be cruising over a little known Republican state senator, Scott Brown. Three days before the Massachusetts special election, the unthinkable has happened: Coakley and Brown find themselves in a foot race, in one of the most Democratic states in the nation, the home state of the ``liberal lion'' Edward Kennedy whose seat both candidates are vying for in which the stakes couldn't be higher. At stake is the decisive 60th vote in passing health care reform; a Brown upset presumably shatters President Obama's hope of signing into law a historic overhaul of nation's health care, something the late Senator Kennedy championed during his 47 distinguished years in the Senate. As far as New England comebacks go, a Brown victory on Tuesday would be akin to the Boston Red Sox storming back from a 0-3 deficit to the New York Yankees in the 2004 American League Championship Series to advance to the World Series for the first time since 1918.