I was one of those rare species: a black Republican, the guy willing to spit into the wind of conventional thought, who was often showcased on camera at party events to prove inclusiveness. But as a proud black man, I can no longer be a member of the Republican Party. Being a Republican has long been a part of my personal and professional identities, so leaving the party is a difficult and emotional decision. In 1998, as a young man searching for what I believed were shared values, I cut ties with the Democratic Party and became a Republican. Democrats,...