Once again, health care took up a large chunk of a Democratic primary debate. Once again, there were fights over costs, coverage and whether the party is growing too extreme.
But this time, all of the front-runners were onstage together, providing the first opportunity for all of them to take direct aim at each other and their vastly differing health care plans. It made for some heated exchanges, putting "Medicare for All" supporters on defense. But it also showed clearly that some candidates are cautious not to criticize others' proposals too harshly.