Mezue ahịrịokwu na-esonụ: Mgbe ọ hapụsịrị Congress, O'Brien maliteghachiri ijikwa ọdịmma azụmahịa ya. O jere ozi dịka onye nnọchiteanya na Democratic National Convention na
Ọ bụ n'afọ 1916. Ọ nwụrụ na Brooklyn na Septemba 2, 1924, ma lie ya na Holy Cross Cemetery.