Half of this poll was taken before Bernie's dominating Michigan Miracle and the fine whuppin he laid at the debate.
GREAT NEWS!
What makes you so convinced that the Michigan result will have such a profound impact elsewhere? Most polls have shown the vast majority of voters deciding at least a few weeks before election day, and it's not like the remaining undecided were up all night on Tuesday pinning their vote on whoever won Michigan while completely ignoring the rest of the election. Not to mention the analysis that says that Sanders was helped in Michigan specifically because people were starting to see this as a non-competitive election as a whole. I don't know if Clinton will win Missouri, although I think she has a better than 50/50 shot, but Michigan will not have been the determining factor either way.