I would question the classification of Bourne as a "Marxist", based on this quote:
“ Intellectual radicalism should not mean repeating stale dogmas of Marxism. It should not mean ‘the study of socialism.’ " - from "The Price of Radicalism"
Some more quotes by Bourne on war and also one on the presidency(which definitely fits with how the presidency has evolved during the 21st century in the United States):
"It automatically sets in motion throughout society those irresistible forces for uniformity, for passionate cooperation with the Government in coercing into obedience the minority groups and individuals which lack the larger herd sense. The machinery of government sets and enforces the drastic penalties. … in general, the nation in wartime attains a uniformity of feeling, a hierarchy of values culminating at the undisputed apex of the State ideal, which could not possibly be produced through any other agency than war. Other values such as artistic creation, knowledge, reason, beauty, the enhancement of life, are instantly and almost unanimously sacrificed, and the significant classes who have constituted themselves the amateur agents of the State, are engaged not only in sacrificing these values for themselves but in coercing all other persons into sacrificing them." - from The State
"In your reaction to an imagined attack on your country or an insult to its government, you draw closer to the herd for protection, you conform in word and deed, and you act together. And you fix your adoring gaze upon the State, with a truly filial look, as upon the Father of the flock, the quasi-personal symbol of the strength of the herd, and the leader and determinant of your definite action and ideas." - from The State
"The President is an elected king, but the fact that he is elected has proved to be of far less significance in the course of political evolution than the fact that he is pragmatically a king." - from The State