No, it does not. Article II, Section 2, Clause 2 as quoted above in post 24, requires only 2/3 of Senators PRESENT for ratification. If there is but a minimum quorum of 51, that is 34.
You owe FR $1,000.
First, I never took the bet. Second, my original post simply asked whether you were worried we couldn’t get 34 Senators to block ratification — that is the number sufficient to block it with all the Senators present — nowhere did I assert that 67 Senators were needed to ratify the treaty. In my later post pointing to the 2/3 majority requirement I noted that a smaller number would be needed to block in the case where a mere quorum was present.
I do, however, see why you think my assertion of needing a vote of 2/3 of the Senate was incorrect — I am so used to the norms of parliamentary procedure that I assume “present and voting when a quorum is present” as the normal meaning of all such assertions unless they are modified to the contrary. (I was an old parliamentary-style debater in college, and function as the de facto parliamentarian for every deliberative body I sit on at the university where I am employed.) Requirements that a majority of the entire membership (or some super-majority proportion of the entire membership) vote in favor of some measure are so unusual they are always spelled out explicitly as such in by-laws of organizations that make such requirements.