THE PUNDITS have all but written him off, seeing him swamped by a tropical tsunami of mostly black votes across the Deep South. The party bigwigs - "superdelegates," they call them - have made up their mind, with front-runner Hillary Clinton getting their support by a 20-1 margin. The TV ratings for the televised debates have shrunk.It seems that the only folks who don't want the Democratic presidential primary race to be over are the voters.A surge of blue-collar voters in Michigan - a state that's been battered by bad trade deals and massive job losses - gave Vermont Sen. Bernie Sanders a stunning upset victory in Tuesday's Michigan primary, throwing a lifeline to the campaign of a "democratic socialist" who's campaigned against inequality and big money in politics. Will Bunch Philly.com