Public Opinion Strategies conducted a survey in 13 states with competitive U.S. Senate races (as defined by The Cook Report). The survey was conducted among 1,300 likely voters on August 2-5, 2010. The survey has a margin of error of +2.72% in 95 out of 100 cases. The states surveyed were Arkansas, Colorado, Delaware, Florida, Illinois, Indiana, Kentucky, Missouri, New Hampshire, Nevada, Ohio, Pennsylvania, and Washington.

The survey questionnaire was nearly identical to the one used by Public Opinion Strategies and Greenberg, Quinlan, Rosner Research (GQR) for the June NPR survey of House Battleground districts. Neither GQR nor NPR was involved at all in this poll.

• American Crossroads Senate Battleground Survey Memo (PDF format)
• U.S. Senate Battleground Interview Schedule (PDF format)
• U.S. Senate Battleground Crosstabs (PDF format)