I watched CBS, NBC, & Sky coverage tonight - none of them came to the conclusion that the vote was anti-Obama or anti-Hillary. Instead, they all view it as a pro-Trump vote meaning that it was his message that resonated the most with the electorate. They have not pinned down which particular part of the message had the most significant impact as of yet. But it will be very interesting to see what the voters themselves will say what particular part of his proposed agenda is of greatest significance to them.
I should add that some voters were interviewed but there was no clear consensus as to what the primary issue was.