Positions at a glance
Supporters
The mechanism is usually explained two ways. The expressive account argues voters derive psychological utility from supporting someone "like them," reinforcing group identity. The instrumental account, associated with scholars such as Kanchan Chandra in Why Ethnic Parties Succeed (2004), holds that voters rationally expect co-ethnic representatives to distribute patronage, jobs, or policy benefits to the in-group.
Opponents
Critics caution that "affinity" framings can essentialize voters and obscure issue-based preferences within identity groups. Survey experiments increasingly show that shared identity raises baseline support but is often overridden by partisanship, incumbency, or candidate quality.
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In Kenya's 2022 general election, analysts at the Institute for Security Studies noted strong affinity voting patterns in Kikuyu, Luo, and Kalenjin strongholds aligned with the ethnic backgrounds of leading presidential contenders William Ruto and Raila Odinga.
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