The thing we forget is just 5 years before this event, he OPPOSED and STOPPED the very same law in congress as a democrat. The Civil Rights voting act would have been in force for a half decade except for his obstruction and that's the real black history moment. http://thecitysquare.blogspot.com/2008/01/lbj-vs-civil-rights-act-of-1957.html

Black History 365

Aug 10th 1965 Congress passes the Voting Rights Act of 1965, making it easier for Southern blacks to register to vote. Literacy tests, poll taxes, and other such requirements that were used to restrict black voting are made illegal.