As the number of people of color (PoC) grows in the United States, a key question is how partisanship will develop among this important electoral group. Yet many open questions remain about PoC partisanship, due to limited availability of panel data, a lack of sensitive instrumentation, and small samples of PoC in most public opinion surveys. This brief report leverages a unique panel of African American (N = 650) and Latino (N = 650) eligible voters, before and after the 2020 Presidential Election between Democrat Joe Biden and Republican Donald Trump. Using measures that tap expressive partisan, racial, and national identity attachments, we find that Biden’s electoral victory significantly intensified partisan identity among his Democratic PoC supporters, relative to PoC who were not Democrats and supported Trump. We do not find significant changes in racial or national identities. Our results advance research on PoC’s partisanship.