There are two places where Hugo brings in George Washington that I found interesting, and one explicitly linked Combeferre to Washington:
" The good must be innocent, he repeated incessantly. And in fact, if the grandeur of the Revolution consists in keeping the dazzling ideal fixedly in view, and of soaring thither athwart the lightnings, with fire and blood in its talons, the beauty of progress lies in being spotless; and there exists between Washington, who represents the one, and Danton, who incarnates the other, that difference which separates the swan from the angel with the wings of an eagle."
Which implies Washington=swan=progress=type of thing Combeferre likes. Though the sentence structure is whack, at least in this translation. So I think it's quite likely that he admired the American Revolution.
The other Washington-related LM quote isn't related to Combeferre, but it does deal directly with fighting between armies vs. internecine fighting and with the compatibility of the American and French Revolutions.
"By what right should the sword of Washington disown the pike of Camille Desmoulins?...Despotism violates the moral frontier, an invasion violates the geographical frontier. Driving out the tyrant or driving out the English, in both cases, regaining possession of one's own territory."
Here day embraces night, and says: I will die with you and you will be reborn with me. From the heavy embrace of all desolations springs faith.
The real name of devotion is disinterestedness.