But the view in the Romney camp is that they still have more highly motivated voters and that it will be hard for Mr. Obama to repeat the fervor he generated four years ago in winning the White House initially.

WSJ: Three Reasons the Presidential Race Isn't Over

President Barack Obama said for the first time on Tuesday that he ultimately was responsible for the safety of four Americans who were killed in Libya last month, but denounced as "offensive" Republican charges that the White House initially resisted labeling the incident a terrorist attack.

WSJ: Obama Takes Responsibility for Deaths in Libya

In the case of a Louisiana serial killer, eyewitness descriptions and psychological profiling initially directed police towards a white male suspect.

BBC: Painting a suspect's portrait with DNA