The Senate’s Sergeant at Arms, Terry Gainer, joined Facebook to deliver a picture perfect apology to the survivors of the so-called Purple Tunnel of Doom, a group of several thousand people who were kept out of President Obama’s inauguration even though they had tickets. It takes a superior apology to address a colossal failure, and Gainer certainly delivered. The sincerity and completeness of the apology easily make it one of the best mea culpas we’ve ever seen.