The Republican Party attracted many black people and Horace was able to win an important position in the party. He was a recurrent delegate to the county and state nominating conventions, secretary of the party’s King County convention in 1902, and for many years a member of the Republican State Central Committee. In Seattle, between 1900 and 1910, the number of blacks had risen by almost 2,000 people causing white prejudice to grow. Politically Horace lost power and after 1910 he never sat on the Republican State Central Committee or attended a Republican convention again.