> enough renters to form a voting bloc

Maybe, but voting would only matter if there was a referendum, which is highly unlikely for something that isn't challenging fundamental rights. Taxes are easily repealed if the people realize they made a mistake. It not need that kind of level of agreement.

What does matter is having time to participate in democracy. It very well may be that in theory the renting crowd have a loud enough voice to be heard, but in practice do they really have the time/the feeling of having enough time to actually do it? Statistically, renters are lower income and tend to struggle to make ends meet. While making themselves heard would be beneficial, often they face other pressures, like needing to go to work, instead that diminish their ability to carry through with it.