The audience at American University roared. It was mostly young people, and to them, the Clintons are as old as the Trumans were in 1960. And in the students’ rapture for Kennedy’s message, you began to see the folding over of generations, the service generation of John and Robert Kennedy united with the service generation of the One Campaign. The grandparents and children united against the parents.

How could the septuagenarian Kennedy cast the younger Clintons into the past? He could do it because he evoked the New Frontier, which again seems fresh. He could do it because he himself has come to live a life of service.

After his callow youth, Kennedy came to realize that life would not give him the chance to be president. But life did ask him to be a senator, and he has embraced that role and served that institution with more distinction than anyone else now living  as any of his colleagues, Republican or Democrat, will tell you. And he could do it because culture really does have rhythms. The respect for institutions that was prevalent during the early ’60s is prevalent with the young again today. The earnest industriousness that was common then is back today. The awareness that we are not self-made individualists, free to be you and me, but emerge as parts of networks, webs and communities; that awareness is back again today.

Sept. 11th really did leave a residue  an unconsummated desire for sacrifice and service. The old Clintonian style of politics clashes with that desire. When Sidney Blumenthal expresses the Clinton creed by telling George Packer of The New Yorker, “It’s not a question of transcending partisanship. It’s a question of fulfilling it,” that clashes with the desire as well.

It’s not clear how far this altered public mood will carry Obama in this election. But there was something important and memorable about the way the 75-year-old Kennedy communed and bonded with a rapturous crowd half a century his junior.

The old guy stole the show.