Among Likely Voters:
48-30 Romney
45-30 Perry
44-30 Cain
Between 11 and 15 percent of likely voters volunteered that they would vote for neither Obama nor the Republican candidate in the question, and between 11 and 14 percent said that they didn’t know whom they would vote for or refused to answer, depending on the question.
Fully 63 percent now say that they disapprove of the job that the president is doing, while only 30 percent say they approve, with the rest saying they don’t know whether they approve or disapprove, or refusing to answer the question.
...
Poll interviews were conducted by telephone Oct. 3-14, 2011 by students in the College of Mass Communication at Middle Tennessee State University. Students interviewed 640 people age 18 or older chosen at random from the state population. The poll has an estimated error margin of ± 4 percentage points at the 95 percent level of confidence
http://mtsusurveygroup.org/wp-content/uploads/2011/10/MTSU_Poll_Fall2011_Report.pdf
