Growing Discord among the Democrats

After yesterday's win in Oregon and a virtual tie in Kentucky, Bernie Sanders drew another massive crowd last night near Los Angeles, where he energized the crowd, "And, we're going to win in California!." But even if that happens, Party rules make his nomination unlikely, and angry supporters could make for a rowdy convention. As mainstream Democrats call on Sanders to keep those people in line, there's a fall-out among two core constituencies: union labor and environmentalists. Will unity be more of a challenge for Democrats than it is for Republicans?