The only polling data available is pretty old.
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http://www.realclearpolitics.com/epolls/2010/house/ia/iowa_2nd_district_millermeeks_vs_loebsack-1680.html
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Poll Date 8/31 - 9/3
Sample 300 RV
Loebsack (D) 47%
Miller-Meeks (R) 39%
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This more recent poll says the race is virtually tied at 41-40. Actually, turnout is everything. Dr. Miller-Meeks is on the ballot between Chuck Grassley and former/future Governor Terry Branstad, both of whom will win easily. I hope that they will carry her over the line.
http://mariannettemillermeeks.com/download/Miller-MeeksforCongressPollingMemo.pdf