Following graduation from Michigan in 1914, Blanshard enrolled in Harvard Divinity School. Prior to entry, he joined the Socialist Party, of which he remained a member for 19 years. Blanshard found his studies replete with "verbal evasion" and wryly observed that "This institution was what Mark Twain would have called a theological cemetery". He joined the Boston Socialist Party and sometimes was dispatched to local strikes as a clerical agitator. Under these casual arrangements he met both Nicola Sacco and Bartolomeo Vanzetti. Blanshard described his early preaching experience as relying more upon Bernard Shaw than the Bible.