WI Martin Luther King Jr. not assassinated?

Because it's MLK Jr. Day and it's on my mind. What are the possible effects that would arise from MLK Jr. not being assassinated in 1968? A stronger focus on the Poor People's Campaign in the coming months and years? How does King react to the Nixon, Ford, Carter, Reagan, et al. years? Is there a political career in King's future, at some point?
 
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