Iowans, who have had much more time to examine and judge the candidates, lean toward Obama against the leading Republican candidates. He beats all of them by much wider margins than Clinton. One obvious example: in a Clinton-Romney match-up, Clinton wins by 48 to 45. Obama beats Romney 51 to 39. Obama is over 50 in every match-up; Clinton below 50 in all of them.

We want to hear what you think about this article. Submit a letter to the editor or write to letters@theatlantic.com.