Using videorecorded data from canvassing interviews between activists and voters in Los Angeles, this thesis examines the ideologies of sexuality that emerge in conversation through the interactive construction of argumentative reasoning and socio-semiotic processes of ideological representation. Analysis focuses on the discursive connections canvassers and voters draw between attitudes toward LGBT politics and beliefs about what causes a person to be gay or bisexual. In contrast to ideologies circulated by the mass media, the data demonstrate broad variation in how voters' stances on politics and morality are tied to their own presentations of self and whether they believe homosexuality is something people choose, are influenced toward, or are born with. Nonetheless, canvassers misrecognize this variation and generate restrictive ideological representations through processes of iconization, erasure, and dichotomic replication. In order to better promote LGBT political causes, I call on activists to rethink their persuasive strategies in light of these findings.