James Earl Ray (King's killer) was not a Democrat. He supported George Wallace as a member of the American Independent Party, which had ideologies such as American nationalism, Paleoconservatism, & Right-wing populism. Charlie Kirk's killer, was from a Republican family, but non-affiliated, so also not a Democrat. MLK fought for Civil Rights, Charlie Kirk said King was not a good person and the Civil Rights act was a mistake. You tried though.
I'm just gonna leave this here...
https://news.osu.edu/when-europeans-were-slaves--research-suggests-white-slavery-was-much-more-common-than-previously-believed/#:~:text=While%20African%20slaves%20did%20grueling,rowing%20the%20corsair%20galleys%20themselves.