Not quite all the votes have been counted yet, but the vast majority have been (including 93% in California), so I decided to quickly tally up the total votes for Hillary Clinton and Barack Obama yesterday to see if either managed to satisfy my arbitrary criterion for a "winner". Remember, that arbitrary criterion was a margin in the total number of votes of around 4%.
The results so far (8:40 AM CST), not including Alaska, which I only saw delegate totals for (but it's a small state so won't throw things off by too much):
Hillary Clinton 7.286 million votes
Barack Obama 7.242 million votes
That's a difference of 45,000 votes out of 14.5 million -- less than a third of a percent.
So Super Tuesday, the first near-national primary, was essentially a tie.