It's often pointed out that our political system is completely corrupted by money yet history teaches that people's influence on their governments is much more powerful than we usually imagine. It's weakened primarily by people's failure to do anything and the mistaken belief that we don't have the power to shape the world as we wish it to be.
Marx and Engels strongly supported political action in the sense of participating in elections. They stressed the importance of the vote. Engels explains that universal suffrage "in an England two-thirds of whose inhabitants are industrial proletarians means the exclusive political rule of the working class with all the revolutionary changes in social conditions which are inseparable from it." Marx argued along the same lines, for example, in 1855, he stated that "universal suffrage . . . implies the assumption of political power as means of satisfying [the workers'] social means" and, in Britain, "revolution is the direct content of universal suffrage."
In 1852 Marx wrote, concerning the Chartists:
“But universal suffrage is the equivalent of political power for the working class of England, where the proletariat forms the large majority of the population, where, in a long though underground civil war, it has gained a clear consciousness of its position as a class and where even the rural districts know no longer any peasants, but only landlords, industrial capitalists (farmers) and hired labourers. The carrying of universal suffrage in England would, therefore be a far more socialistic measure than anything which has been honoured with that name on the continent. Its inevitable result, here is the political supremacy of the working class.” [Marx emphasis]
His meaning is clear - a working class majority in Parliament, backed by a majority of the population, can bring about the real transfer of power.