S900 was not named GLBA May 6 1999. McCain did not vote for GLBA. He voted for S900. I suppose you could say that he voted for a bill that turned into GLBA.

If the bill would have passed on Nov 4, even if everybody voted against it, why did Dems change their vote form Nay to Yea? Why didn't they vote against it again? Why even go through the motions of a vote when I would pas regardless of the vote?

It says "Differences Resolved Nov 4, 1999" I assume that means the Democrats agreed to the contents of the bill and passed it Nov 4.

Do you want to cherry pick the votes so you can say Dems actually voted against the bill before they voted for it?

November 4, 1999 -- Gramm-Leach-Bliley Act passes the Senate 90-8 and the House 362-57