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About this Poll

“It says to me that Franken is running a competent campaign and has a shot to defeat the seemingly invincible Chuck Grassley — previously perceived to be invincible,” said pollster J. Ann Selzer, president of Selzer & Co. The poll of 804 Iowa adults, including 620 likely voters, was conducted Oct. 9-12 by Selzer & Co. The questions asked of all Iowans have a margin of error of plus or minus 3.5 percentage points; it's plus or minus 3.9 percentage points for the questions asked of likely voters.