In this study we examine how vaccination perceptions were constructed over time by white mothers in the US during the first two years of the Covid-19 pandemic. We analyze longitudinal, weekly journals created between May 2020 and May 2022 by 54 mostly well-educated, liberal-leaning white mothers as part of the Pandemic Journaling Project (PJP). PJP is a digital journaling platform and research study that records and preserves ordinary people’s experiences of the Covid-19 pandemic. Drawing on Rebecca Lester’s concept of “dialogic interiority,” we treat journals as documentary evidence of the moral “self-talk” in which ordinary people engage when they weigh and debate vaccine choices. In their journals, our participants – almost all of whom declared an intention to vaccinate against Covid-19 – anchored uncertainties about the efficacy and safety of vaccines within a broader analysis of the morality of pandemic behavior. Participants did not trust their institutions or fellow citizens to act with moral integrity, rendering collective action in response to Covid-19 exceptionally difficult. By offering what Goffman calls a “glimpse into the dealings [people] are having with [themselves],” this study provides potential insights into how and why Covid-19 vaccination campaigns floundered in the US – and how it might be possible to do better in the future.