Kerry won because of his veteran status, but he was a flaming liberal. Bill Richardson is not. That's not to say he won't get the nomination, but his chanches are very slim.
Richardson might be compared to Joe Lieberman in that poll and look what happened to the latter.
Then this is from the month before that:
Howard Dean 14%
Wesley Clark 9%
Joe Lieberman 9%
Richard Gephardt 12%
Al Sharpton 3%
John Kerry 7%
John Edwards 2%
Carol Moseley-Braun 4%
Dennis Kucinich 2%
JFK was fifth in that poll.