This paper provides an ethnographic perspective on the street-level deliberations of Kenya's opposition supporters between the 2013 and 2017 elections, arguing that rather than appeals to ethnicity what defines its discourse are broader, inclusive notions of political membership. A civic nationalism is enunciated by opposition supporters that congeals support between multiple ethnic groups through its emphasis on universal values – democracy, due process, equality, adherence to the constitution. However, when such civic ideas are used in political campaigning and mobilising rhetoric, describing a resurgent Kenyan ‘people’ that has been systematically disenfranchised, they take on an exclusionary character. As ‘good constitutionalists’, opposition supporters contrast themselves with ‘bad nationalists’ associated with the government, portrayed as mobilising particularistic ethnic loyalties at the expense of a majority of Kenyans. In practice, their civic ideas remain only potentially inclusive.