Why White Iowans Want a Nominee Who Can Appeal to Nonwhite Voters. Whites, Iowa, Race and Ethnicity, Presidential Election of 2020, Primaries and Caucuses, Voting and Voters, Democratic Party, Biden, Joseph R Jr, Booker, Cory A, Buttigieg, Pete (1982- ), Castro, Julian, Harris, Kamala D, Klobuchar, Amy, Obama, Barack, Sanders, Bernard, Warren, Elizabeth