Johnson-McCarthy '64

This was considered briefly in 1964 after Lyndon Johnson decided he did not want a "Government of Party Unity" in July. What would happen down the road, '68 in particular?
 
Bump. Any takers? IMO, this is worst possible outcome for LBJ if OTL happens, because come March 1968, we will have two presumptive nominees, not one. Who to take up the ABB sword? IOTL LBJ wanted Rocky.
 
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