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Previous researchers have speculated that incumbency effects are larger when voters have weaker partisan preferences, but evidence for this relationship is surprisingly weak. We offer a fresh look at the question by examining the United Kingdom's multiparty system. In general, the electoral value of incumbency should depend on the proportion of voters who are nearly indifferent between the parties competing for incumbency; in a multiparty system, that proportion may differ across constituencies depending on which parties are locally competitive. After first showing that UK voters in recent decades have stronger preferences between Conservatives and Labour than between Conservatives and Liberals, we show that incumbency effects are larger in close contests between Conservatives and Liberals than in close contests between Conservatives and Labour. By documenting how partisanship influences incumbency effects, our analysis shows that the comparative study of incumbency effects offers broader insights into electoral accountability across political systems. [ABSTRACT FROM AUTHOR]

Many studies have shown that incumbent candidates have an electoral advantage over nonincumbents under single-member-district systems, but less is known about whether incumbents enjoy the same electoral bonus under other electoral rules. This article focuses on multimember-district systems that allow intraparty competition and contends that incumbents may have little advantage or even a disadvantage over nonincumbents of the same party under these systems, although the incentives to cultivate a personal vote-one of the main sources of incumbency advantage-are greater in these systems. I demonstrate my argument using electoral data from Japan during 1958-93 when the country used the single nontransferable vote system. Having applied an estimation of incumbency advantage immune to endogeneity bias due to strategic retirement, I find supportive evidence to my argument. The results suggest that there is an important variation in incumbency advantage across electoral systems. [ABSTRACT FROM AUTHOR]