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Mostly resisted opportunities to ak at that time democratic front-runner wp we'll see what happens tomorrow night in vegas. as the big event approaches there's ongoing discord about the limited number of democratic primary debates, just six compared to 11 for the republicans and the somewhat mysterious criteria for candidates to participate. while three of the democratic candidates, lincoln chafee, martin o'malley, and lawrence lessig all scored less than half a percent in the latest national polling, only two of them get to take part tomorrow. lessig is the only one being excluded from the de...

Front-runner wp we'll see what happens tomorrow night in vegas. as the big event approaches there's ongoing discord about the limited number of democratic primary debates, just six compared to 11 for the republicans and the somewhat mysterious criteria for candidates to participate. while three of the democratic candidates, lincoln chafee, martin o'malley, and lawrence lessig all scored less than half a percent in the latest national polling, only two of them get to take part tomorrow. lessig is the only one being excluded from the debate stage. this is what it will look like. according to the...

Corporations, big corporations with the secretary. >> up until now sanders has mostly resisted opportunities to ak at that time democratic front-runner. we'll see what happens tomorrow night in vegas. as the big event approaches there's ongoing discord about the limited number of democratic primary debates, just six compared to 11 for the republicans and the somewhat mysterious criteria for candidates to participate. while three of the democratic candidates, lincoln chafee, martin o'malley, and lawrence lessig all scored less than half a percent in the latest national polling, only two of them...

Completely on their sides. in total, seven cars derailed. we're told families of four people killed have not been notified. we know there were three conductors onboard this train and one engineer. all four of them have been located. we don't have a word on their condition. again, we do know the person who was operating this train has according to a cnn source told law enforcement officials that he did apply pressure to the brakes and that the train did not stop. there is a bend in the track here. witnesses say that they heard this happen this morning. they heard a squealing sort of screeching ...

Are going quickly and they say it's speedy devil. we can't say if speed is a factor. we know at this point according to our cnn source that train operator said he tried to apply the brakes and train didn't stop. that is to start off this investigation what we're told the operator of the train is saying. witnesses can't really tell us for sure right now whether or not that train was going fast or too fast. a question for ntsb on the way here to try to answer it. >> alexandra field on the scene for us. we'll keep in touch with you and get back to you when the situation warrants. new york governo...