This article presents a narrative of urban mobility and desire, and critically examines recent ethnographic approaches to subjectivity and "becoming" among rural–urban migrants and in urban life. Lately, ethnographic approaches to urban lives have emphasized mobility over fixity and sought to describe possibility and potential, even in cases of extreme abjection, in part inspired by the philosophy of Gilles Deleuze. I examine the strengths of this "vitalist" approach to urban ethnography through an extended analysis of a fragmentary narrative of urban mobility, setting it in a wider context of political change in Delhi to show that both the reality and the interpretation of these events depend upon the prior occupation and affective shaping of distinctive urban places, or milieux, and the ongoing conceptual structuring and discursive elaboration of political meanings. I argue that such affective structures and urban mediations deserve more attention in ethnographic accounts of migratory desire and becoming.