Time/SRBI — Obama 49, Romney 44

Lake Research — Obama 46, Romney 44

Rasmussen (automated) — Obama 48, Romney 48

Survey USA (automated) — Obama 47, Romney 44

HuffPost Pollster (aggregate) — Obama 48.4, Romney 45.8

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I would not go so far as to say that Obama has a firewall in Ohio, but he has led here consistently.