FWIW... I think a visible abstain option should be left available for those few instances where the Talkboard member feels strongly that they should not be part of the vote, but doesn't want to hold up the voting or risk being considered a missed vote.

However, I do not believe that someone who abstains should be counted as a defacto "no" vote, and the 2/3 majority should be only counted off of those who vote yes or no.