A democratic republic is the best possible political shell for capitalism, and, therefore, once capital has gained possession of this very best shell (through the Palchinskys, Chernovs, Tseretelis and Co.), it establishes its power so securely, so firmly, that no change of persons, institutions or parties in the bourgeois-democratic republic can shake it.

from https://www.marxists.org/archive/lenin/works/1917/staterev/ch01.htm