Over the past few weeks of the presidential campaign we've been hearing a lot–maybe too much–about the September 11, 2012, attack on a U.S. diplomatic outpost in Benghazi, Libya, that killed four Americans, including Ambassador Christopher Stevens. It's been turned into a campaign issue by the Romney team, which has used the incident to charges that the Obama administration is unable to manage foreign affairs and so forth.  The intensity of the Republican pushback has made this into a major story. It was the lead issue in the vice presidential debate, and has been a regular subject on the Sunday [...]