James FitzHugh was a Continentalist Senator from California in the 1860s. FitzHugh owed his election to wealthy San Francisco businessman and Kramer Associates founder Bernard Kramer. When Kramer went to Mexico City in March 1867 to gain government support for his plan to build a canal in Guatemala, FitzHugh was one of the men he met with. FitzHugh spent the next several months lobbying President Arthur Conroy on Kramer's behalf.
Although Sobel does not specifically say so, FitzHugh was presumably one of the Continentalist Senators who opposed the Conroy reforms in the 1860s and the Kinkaid reforms in the 1870s, also at Kramer's behest.