The Ohio State football team has been the top-ranked team in the country since it took down Texas in the first game of the season. They haven't come close to losing a game since then, as the Longhorns are the only team to actually challenge them thus far. The Buckeyes might not have played the best schedule, but they are clearly the best team.
Those who are paid by ESPN would like you to think differently. While most aren't naive enough to try and argue that an SEC team should be at the top, some of them have started arguing that Indiana is better than Ohio State.