The CNN Polling Center displays data from polling organizations that use CNN-approved
polling methodology as well as some that do not. The asterisk symbol * indicates that
the poll or polling organization does not meet CNN's methodological standards.
A CNN Poll of Polls is calculated using at least three polls that use CNN-approved methodology.
The Congressional Ballot polling data was provided by PollingReport.com.
Todd Graham is the director of debate at Southern Illinois University, Carbondale. He has coached his teams to national championships and has been honored with the Ross K. Smith national debate coach of the year award.