Interesting. Is there a page where we can see the entire "primary roll" (I assume that's what was used) breakdown, or did you get these statistics from having part in running the poll?

As for an explanation, the amount of experience one has in the field will have a indirect relationship to one's poll results through any number of routes (given the number of participants), of which some are more common among participants, where each route leads to a particular conclusion--and some to the same conclusion. The commonalities in participants' routes lead them to common conclusions. 

Though I have a feeling that's not what you meant by explanation? 

p.s. I am new to this site and must say it's awesome!