Anti-Hillary people really shouldn't be talking about popular vote after what happened to her in 08...
Anyway, there's no way to know, so this thread is pointless. It's like asking what the REAL results in North Korea or Belarus were.
Not everyone who supports Sanders is a generic "anti-Hillary" person. Also Obama won the caucuses so in reality he probably did win the popular vote, not that I really care either way.
Anyway, I think that more people preferred Clinton, but Sanders probably won once you add the O'Malley people to his side. I don't think there was "foul play"; it's just an inherent problem with how the Democratic caucus works.