you d say he is a major threat to her candidacy. because he has to prove that he can at the moment on that stage tonight, he s the only threat. no question about it. but he has to show that he can be president of the united states. bernie sanders has an electability issue. and what he has to prove on that stage tonight is he s up against hillary clinton whom people have known nationally for decades and who is a former secretary of state, that he can lead the country particularly on foreign policy issues. which we haven t heard a lot. stand by, guys. we re just a little bit more than two hours away from the start of this cnn democratic presidential debate here at the wynn hotel in las vegas. all eyes tonight are on the front run arunner hillary clint bernie sanders.