divided democrats still are on issues like health care. each candidate hoping to stand out from the crowded field. front-runner joe biden started thursday night's debate with a new strategy. >> i know that the senator says that she's for brotherernie. well, i'm for barrack. >> the former vice president took the two progressives head-on. >> my plan for health care costs a lot of money. it costs $740 billion. it doesn't cost $30 trillion. $3.4 trillion a year. how are we going to pay for it? >> how do we pay for it? we pay for it, thoese at the vey top, the richest individuals and the biggest corporations are going to pay more. and middle class families are going to pay less. >> every study done shows that medicare for all is the most cost effective approach to