Elisha Benjamin Andrews,
History of the United States, Volume 6
“ What effect will this Progressive movement have upon party organization? As matters stand at present there are in reality four parties within the bonds of the two old parties-- (1) the Conservative Republicans of the East; (2) the Conservative Democrats of the South; (3) the Progressive Republicans of the West; (4) the Progressive Democrats of the West. Out of this tangle it appears that either a new party will be formed by the combination of the Progressives of both old parties, or this Progressive movement must gain control of one or the other of these parties. ”
