Earlier quoted context omitted.
The working class is already radicalized, however it's powerless through division. A poor minority in the city and a poor majority in the countryside have a lot more in common than either of them might like to believe; their economic interests are shared as they are both simply the working class. However, the poor person in the city is unlikely to vote at all, and the poor person in the country is likely to vote agai…
IIRC, revolutionaries in Russia didn't wait for the proletariat class consciousness to arise on it's own, as it had been predicted by Marx. The middle class helped spark the revolution hoping that the proletariat would come around eventually. The fact that the article, and many of the commenters here are mentioning this again makes me wonder if socialist movements have always been primarily middle class movements.
That resulted in several decades of false starts by what Krein would call the Russian "secondary elite", in the form of the Narodniks, in the 1870s and 1880s. They had almost zero experience with the real "narod", only an idealized mental picture, and when they moved out of the big cities into the countryside (where the majority of the poor, Russia being vastly unindustrialised, lived), most of them got homesick and went back again.