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.
They were not kicked out and they were still around to lobby those who
could vote although it was just the coronation of LBJ and any vote was
just going to be ceremonial. Johnson's platform was a pack of lies
anyway and we went back on most of it ... most notably the war. That
is why he kicked himself out of the 68 election before he had the
embarrassment of being only the second sitting president not to get
the nomination of his party.