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Story summary
- Barack Obama will speak at a Cleveland, Ohio rally on Oct. 24 with Sherrod Brown and Amy Acton.
- He launched a 30-second TV ad endorsing Mississippi Senate candidate Scott Colom on Oct. 12.
- The ad aired on CBS affiliate WCBI as part of a seven-figure media purchase.
- Data for Progress poll shows Scott Colom trailing incumbent Cindy Hyde-Smith by about six points.
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