Henninger: Suddenly, A Credibility Gap - WSJ.com There have been only two events that could be said to have caused significant movement by voters in the campaign. One was the Oct. 3 Denver debate in which Mitt Romney disinterred political skills that stunned the incumbent and woke up a sleeping electorate. Race on. The other is Benghazi. The damage done to the Obama campaign by the Sept. 11 death in Benghazi of Ambassador Chris Stevens and three American colleagues has been more gradual than the sensation of the Denver debate, but its effect may have been deeper.