I have not seen a poll on this race in quite sometime. Do you have a link that shows Bell in running 4th?
A little dated but fairly recent. The link has internals in a pdf format if'n you are interested.
Texas gov. poll, Sept 26 - Oct. 3, DMN
http://www.dallasnews.com/sharedcontent/dws/dn/latestnews/stories/100506dntexgovpoll.252570c.html
38% -- Perry
18% -- Strayhorn
15% -- Bell
14% -- Friedman
14% -- Undecided