partyism
/ˈpɑːtiɪz(ə)m/noun
Excessive attachment to a particular (especially political) party; party spirit. Also: the political system by which elections, debates, etc., are contested by parties.
- Now frequently as the second element in compounds relating to a particular political stance, as anti-partyism, one-partyism..
Origin
Mid 19th century; earliest use found in Biblical Repertory. From party + -ism.