State of Disunity: LBJ withdraws earlier

IOTL LBJ considered withdrawing in his Jan. 1968 State of the Union, but decided against announcing it at that time. WI he did? This means the Democratic race starts before Tet, or Nixon jumps the gun as well. All the primaries will now be contested, and if HHH only participates by proxy as per OTL, we see a close Gene-RFK race in NH, since I doubt McCarthy would withdraw. What would the results be down the road?
 
One question, which has different answers. If push came to shove, what would happen to the McCarthy delegates if RFK lives? In my scenarios, they're released and split 50-50, or Nixon announces in late '67, forcing RFK to do the same and preempting McCarthy.
 
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