As Kiss of Judice notes, Dr. Ron Paul is winning many of the categories on the MSNBC poll. The reason this isn't being reported is that nobody believes the votes are representative of the electorate. It is very likely that Dr. Paul has done a good job of organizing his supporters to vote online -- and to call in to CSPAN radio.
It's also possible that Democrats would legitimately find Dr. Paul's stances appealing -- and vote for him.
Personally, I admire Dr. Paul, but believe him to unelectable in our current political environment.