the democratic party―(米国のは)―the Democrats
the Constitutional Party―the Constitutionalists
the Liberal Party―the Liberals
the conservative party―the conservatives
the party out of office―the party out of power―the outs―the Opposition
a Liberal
the revolutionists
the Imperialists
the moderate party―the moderates
the Progressive Party―the Progressionists
the republican party―(米国のは)―the Republicans