Among "all potential voters", Obama holds a 52.7% to 41.1% lead.
Among "likely voters", Obama holds a 50.0% to 46.2% lead.
The poll asked whether individuals are very likely, somewhat likely, likely, very unlikely,
somewhat unlikely, or unlikely to vote for a given candidate. The results shown above contain
both effects of keeping unlikely and likely voters and eliminating any participant who indicated
very unlikely, likely, and somewhat unlikely to vote.
http://www.realclearpolitics.com/docs/2012/Gravis_MI_0928.pdf
