Benghazi has damaged voters' willingness to believe in Barack Obama.
It is conventional wisdom that incumbency breeds advantages. But incumbency also brings burdens, and the Obama candidacy looks like it's buckling beneath one: Of the two candidates, the president is held to a higher standard of behavior.
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.