The final Ohio Poll leading up to the Nov. 6 vote finds President Barack Obama leading Gov. Mitt Romney by 50.0 percent to 48.5 percent. The poll’s margin of error is 3.3 percent, so either candidate could be leading and thus, the race is too close to call. Maddeningly, the Institute for Policy Research at the University of Cincinnati, which conducted the poll, does not publish its partisan sample numbers in its final poll. Its Oct. 31 poll, which had Obama leading by two points, had a slight Democrat tilt of 487 voters to 480. That poll also had a slightly larger sample size of 1,182 voters to 901 “probable” voters in the final poll.
As Zombie discovered, polls with samples of under 1000 voters tend to favor Obama, while polls with samples larger than 1000 tend to favor Romney.