The CNN Poll of Polls is an average of three national polls of likely voters conducted over the last week: NBC News/Wall Street Journal (September 12-16), Monmouth University (Sept. 13-16) and AP/GfK (Sept. 13-17). The Poll of Polls does not have a sampling error.
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.
A new national poll released Tuesday indicates President Barack Obama with a slight edge over Republican nominee Mitt Romney, with the candidates' numbers virtually unchanged compared to their positions before the two parties' conventions.