The data.frame must have a column named region with a 4-character Congressional District code. Remove districts that have a district code of 98 (non-voting) or ZZ (undefined district). See https://www.census.gov/geographies/mapping-files/2019/dec/rdo/116-congressional-district-bef.html At the time this function was created, tidycensus returned 5 non-voting districts. See https://github.com/walkerke/tidycensus/issues/277
A data.frame. Must have a column named region that contains character vectors of length 4. The first 2 characters should be a state FIPS code and the second 2 characters should be a Congressional District Number
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