Under a present-and-voting rule, mass abstention lets a tiny minority pass a bill.

Evidence

  1. Assuming a quorum of 53 House members and 18 Senate members are present when a vote is taken, a majority of those 53 House members (at least 27) and a majority of those 18 Senators (10) must vote in favor of the bill; or 3. Assuming a quorum of each house is present, a majority of those present and voting in each house must be in favor of the bill (e.g. if 53 House members are present, and 10 vote β€œyes” and five vote β€œno” and the remaining 38 do not vote, the bill passes the House; similarly, if 18 Senators are present, of which 5 vote β€œyes” and 3 vote β€œno” and the remaining 10 do not vote, the bill passes the Senate). β€” Adrian Vermeule, Absolute Voting Rules, 181

Categorization

  • CANDY: The concrete example β€” 10 yes, 5 no, 38 abstaining and the bill passes β€” is a genuinely tweetable illustration of how voting rules can be gamed.