Analysts in the media and political world are suddenly paying attention to a debate rooted in decades of political science research. In this article, we introduce this debate and its roots in three scholarly camps, each of which is focused on explaining election outcomes -those who stress persuasion, those who stress mobilization, and those who stress fundamentals. The article argues that while each of these camps has something valuable to say about why campaigns are won and lost, none of them in and of themselves explains the ultimate outcomes of competitive national elections. For this, fundamentals matter greatly but cannot offer the final percentage points in ultimate outcomes, where marginal variance can be crucial, while turnout and persuasion together, on top of these economic and partisan fundamentals, yield small but more than occasionally decisive determinants of election outcomes.
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