I have no use for Jean Kerry, but I find this a stretch.
"Scaramouche" is the name of a novel, and the hero of that novel, by Raphael Sabatini. It used to be a fairly popular book. What it suggests to me is that Kerry associates himself with a Frenchman (a handsome duelist, wit, actor, and general all-around Douglas Fairbanks type).
Scaramouche is mistreated by his aristocratic relations, but he gets back at them by proving his superiority. Like most of Sabatini's novels, the plot involves a hero who is mistreated and resentful but gets back at his enemies by proving he is better than they are, winning the duel and the girl. That pretty well fit's Jean Kerry's personality, I think. Except that he is delusional in thinking that he will win in the end.
Oh, I think that the Sabatini novel is a far less likely inspiration, keeping in mind that the singular self-described influence on Kerry's adult life (at least as described by him prior to "reporing for duty" at the Democrat convention) was the Vietnam war, and his actions and feelings in regard to it. The Quiet American is very likely to have been a huge influence on him. (Also, note that the movie changed the plot in certain respects.)
Dead on the mark. Coincidences and odd circumstances are far common than most people realize, the equivalent of figures that we see when gazing at passing clouds in summer.