Endorsement politics refers to the public act of one actor — a politician, interest group, union, newspaper editorial board, celebrity, or party faction — declaring support for a candidate, party, or ballot measure. Endorsements function as information shortcuts (heuristics) for voters who lack the time or expertise to evaluate every candidate, and as coordination signals within coalitions, telling activists, donors, and aligned politicians whom to rally behind.
Political scientists generally distinguish several types:
- Elite endorsements from sitting officeholders or party leaders, central to the "party decides" thesis advanced by Cohen, Karol, Noel, and Zaller in their 2008 book of that name, which argued that pre-primary endorsements historically predicted U.S. presidential nominees.
- Group endorsements from labor unions (e.g., the AFL-CIO), advocacy organizations (e.g., the Sierra Club, NRA), or professional associations, often tied to mobilization resources.
- Media endorsements from newspaper editorial boards, a tradition dating to the 19th century U.S. partisan press.
- Celebrity and cross-party endorsements, valued more for media attention than vote transfer.
Empirical evidence on persuasive power is mixed. Studies of newspaper endorsements (Chiang and Knight, 2011) suggest measurable but modest effects, larger when the endorsement is unexpected. The 2016 and 2024 U.S. cycles complicated the "party decides" framework: Donald Trump secured the Republican nomination both times despite limited early elite backing, suggesting endorsement influence varies with party cohesion, media environment, and voter polarization.
Endorsements also carry risks. A withdrawn or controversial endorsement can damage both endorser and endorsee, and in highly polarized environments cross-partisan endorsements may mobilize opponents as much as supporters. In parliamentary systems, intra-party endorsements during leadership contests — such as MP declarations in UK Conservative or Labour leadership races — perform a similar coordinating role.
Example
In October 2024, the Washington Post's decision not to endorse a presidential candidate — breaking a decades-long tradition — drew over 250,000 subscriber cancellations and became a flashpoint in debates over media endorsement politics.
Frequently asked questions
Evidence suggests modest effects. Endorsements matter most when they are surprising (e.g., a left-leaning paper backing a conservative), when voters lack other information (down-ballot races, primaries), or when they unlock resources like volunteers and donor lists rather than directly persuading voters.
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