The term Dialectical Materialismwas not used by Marx himself but by subsequent Marxists to delineate the synthesis of Marx’s critiques of Hegel’s Dialectics, which he called idealist and Feuerbach’s materialism, which he called mechanical or metaphysical. For the first time the term Dialectical Materialism was used by Plekhanov in 1891.Five years after Marx’s death Engels expressed his and Marx’s gratitude in Ludwig Feuerbach and the End of Classical German Philosophy (1888) “To Feuerbach , who after all, in many respects forms the link between Hegelian philosophy and our conception”. For the “influence which Feuerbach, more than any post Hegelian philosopher” had upon them Engels acknowledged his “undischarged debt of honor”. [SW:585] .
Eric Blanc discusses the history of the Minnesota Farmer-Labor party as showing why socialists ultimately need to break with the Democratic party.