The parliamentary discourse is the important component of the socio-political basis of modern society. The study of its characteristics can explain many social dynamics processes, for example, the activity and apathy of society at elections, as well as the features of civil society. Qualitative studies, based on sociological methodology and discourse analysis, can benefit greatly from automated topic mining provided by topic models such as latent Dirichlet allocation (LDA). In this paper we present the results of analysis the speeches of deputies of the State Duma of the Russian Federation (seven parliamentary sessions). The aim of our work was to find relation between the behavior of parties during parliamentary sessions and the public skepticism about the idea of a multiparty system as a basis of democracy.