dataAsMatrix = {
const catMatrix = USSenateVotingData.map((v) =>
v.members.member
.sort((a, b) => d3.ascending(a.member_full, b.member_full))
.map((m) => m.vote_cast)
);
const opts = {"Yea" : 0, "Nay": 1, "Not Voting" : 2, "Present, Giving Live Pair": 3};
return catMatrix.map(r => r.map(d => opts[d]));
}