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A lot at steak. >> he does and the sanders campaign is acutely aware this is the first time many voters will see him on a national stage facing off with hillary clinton. so the question for him is can he make this into the watershed moment he needs to prove that h viable, general election candidate. >> reporter: bernie sanders faces the biggest test of his campaign so far. >> boston, thank you! >> reporter: the energy that has defined his insurgent candidacy into the next phase of a real contender. >> don't be surprised if we do well with a number of republicans. >> reporter: ground zero, tues...

Matter. let's get right to sunlin. you caught up with bernie sanders. what's his strategy going into tuesday night's debate? >> the strategy does seem to be let bernie be bernie. the campaign at the same time they're very aware this is the first time many voters will see him up on a national stage facing off against hillary clinton. so his goal for the debate is to show that he can be a viable general election candidate. bernie sanders faces the biggest test of his campaign so far. >> thank you. thank you. boston, thank you! [ cheers and applause ] >> reporter: to funnel the energy that has de...