MLK was never a republican you moron.

He didnt subscribe to the democrats either. He was a race man and you were already provided not only a link but a video of him voicing his thoughts but here are some more.
Here is a pdf from stanford of a transcript of an interview at Bennett college.
https://swap.stanford.edu/201412182...ments/Vol4/11-Feb-1958_InterviewAtBennett.pdf
‘I’m not here to tell you how to vote, ”he said. “That isn’t my concern. I’m not a politician. I have no political ambitions. I don’t think the Republican party is a party full of the almighty God nor is the Democratic party. They both have weaknesses. And I’m not inextricably bound to either party. I’m not concerned about telling you what party to vote for. But what I’m saying is this, that we must gain the ballot and use it wisely.”
-MLK
No, Martin Luther King Jr. Was Not A Republican — But Here’s What He Had To Say About Them
"
The Republican Party geared its appeal and program to racism, reaction, and extremism. All people of goodwill viewed with alarm and concern the frenzied wedding at the Cow Palace of the KKK with the radical right. The “best man” at this ceremony was a senator whose voting record, philosophy, and program were anathema to all the hard-won achievements of the past decade."
-MLK