Given how razor thin election margins are, ~33% of the population is far from a invisible class.

For a variety of reasons, homeowners vote. Outside New York City, which unsurprisingly has solid tenant protections, American renters do not.

Correct. Dated, but related and a classic: "We find that neither demographic nor attitudinal attributes explain [people who have recently moved's] lower turnout. Instead, the requirement that citizens must register anew after each change in residence constitutes the key stumbling block in the trip to the polls. Since nearly one-third of the nation moves every two years, moving has a large impact on national turnout rates."

The authors suggested "linking the maintenance of registration to an action that is usually an intrinsic part of moving" such as the "change-of-address notice at a local post office." Interestingly, "holding elections on Sunday, making election day a holiday, or extending the hours that the polls are open...are designed to facilitate people who are registered" and would thus "do little to improve turnout."

https://www.cambridge.org/core/journals/american-political-s...

This is different from the proportion of adults in the US that own a home. Many non-homeowners live in an owner occupied residence.