On the Democratic side Hillary proved she is vulnerable and Sanders proved he can get white people to vote for him not a big win either way.
As neat as it was seeing how close it was, it doesn't really prove anything. Clinton might be "vulnerable," a little, but not enough that I think it will matter.
I feel bad for moving the goalposts on Sanders- first everyone was all "He'll have no support." Then "He'll get support, but not enough." Then he basically breaks even with Clinton, and I say "That's really cool, but if you tied with Clinton in one of your strongest areas, then you're going to lose to her overall."