This shows it is a four person race.
No. it shows that when you have a group of people and they have 4 speakers, they will vote for one of the 4 speakers, and usually based on how much they like what they said right then and there.
Note that Gingrich could barely beat Bachman, and 70% of the people at the meeting chose someone OTHER than Gingrich. He’s not winning over the conservatives.