It comes down to numbers. And in the final days of this presidential race, from polling data to early voting, they favor Mitt Romney.

He maintains a small but persistent polling edge. As of yesterday afternoon, there had been 31 national surveys in the previous seven days. Mr. Romney led in 19, President Obama in seven, and five were tied. Mr. Romney averaged 48.4%; Mr. Obama, 47.2%. The GOP challenger was at or above 50% in 10 polls, Mr. Obama in none.

The...