Hillary and the New York Primary

I'm reminded that New York is a closed primary. I guess that suggests that if Hillary loses it's significant. And California, for the Democrats, is an open primary which suggests that, particularly if Sanders were to win in New York, he will be able to give Hillary a run for her money. 

Yes, Hillary will lose Wisconsin. But New York will be a measure of whether she is strong enough among Democrats themselves. I hope she is because, if she isn't, the doubts about her and her candidacy will surely grow.