In 1911 with a group of liberal-minded lecturers he left the university by way of a protest against the policies of Lev Kasso, the then Minister of Education.

Among other issues he concentrated on in his essays were the decentralization of power, autonomy and federalism, as well as theoretical and practical ways of organizing local governments for Russian provinces.

Arguably his most notable achievement there was law project regulating the principles for the equality of all citizens and the respect for civil right, backed by 151 fellow Duma members.

[1] After the 1907 dissolution of the Russian Duma, Kokoshkin co-authored and signed the Vyborg Manifesto, which he was promptly arrested for to spend three months in prison.

[2] Starting with 1907, Kokoshkin became an active member of the stuff of Russkiye Vedomosti, where he regularly published articles on a wide range of subjects, including parliamentarism, national identity, the situation around the Old Believers.

[2] After the Bolsheviks took power Kokoshkin became actively involved in preparations for the Constituent assembly elections, speaking at rallies and meetings.

"[3] Upon the arrival he was arrested by the Bolsheviks, warrants issued by the Petrograd Military Revolutionary Committee, as one of the leaders of "the party of enemies of the people" and was imprisoned in the Peter and Paul Fortress.

[4] Suffering form tuberculosis, on 6 January 1918 he was transferred, along with his fellow Kadet Andrey Shingaryov, to the Mariinskaya Hospital.