Democratic presidential candidate U.S. Sen. Kamala Harris (D-CA), her husband Douglas Emhoff and her sister Maya Harris prior to her delivering a campaign speech at the Des Moines Register Political Soapbox at the Iowa State Fair on August 10, 2019 in Des Moines, Iowa. 22 of the 23 politicians seeking the Democratic Party presidential nomination will be visiting the fair this week, six months ahead of the all-important Iowa caucuses.