Sentence:  Incentives to engage in the exchange of votes in legislatures, or <WSD>logrolling</WSD>, have existed since the inception of legislatures. Most prominently, <WSD>logrolling</WSD> is alleged in the United States, where a plurality rule is employed to elect representatives from single-member districts. 
Meaning of the word marked with <WSD> tags:  A concerted effort to push forward mutually advantageous legislative agendas by combining two items, either or both of which might fail on its own, into a single bill that is more likely to pass.