A Senate proportioned by income? Six senators would represent Americans making more than $100,000 annually; twenty-four senators would represent Americans making $10,000 or less.
A Senate proportioned along gender and racial lines? White women would be the largest bloc, with 37 votes.
By age? 16 for the Olds and 13 for the Youngs.
And so on. In all cases, is the point Lowrey persuasively argues, the result would be a Senate more authentically representative of the nation as a whole. (And, perhaps not coincidentally, a more liberal one.)