Sentence:  In most of these areas there was improvement between 1920, the year of the second Farmer-Labor ballot and the last election in which the coalition was able to use <WSD>sorehead</WSD> tactics, and the special senatorial election of 1923. 
Meaning of the word marked with <WSD> tags:  A politician who is dissatisfied through failure, lack of recognition, etc. (from 19th c)