They still had their credentials. They just did not get to vote. It
was the same with the 60 black delegates who demanded to be seated
because they felt they should have been elected.
You also did not really "watch" the convention unless you were there.
The networks had a little bit of newsreel coverage but nobody really
wanted to miss Bonanza or General Hospital to see these things. They
also soft pedaled the problems at the convention and concentrated on
the speeches coronating LBJ when they did have televised coverage.
I was around then too and my parents were "all the way with LBJ".
"They just did not get to vote." That says it all.