A proposition isn’t a partisan thing; it’s probably the closest to democracy you get in the US.

Take Texas Proposition 3 from the 2023 elections:

Sec. 25. The legislature may not impose a tax based on the wealth or net worth of an individual or family, including a tax based on the difference between the assets and liabilities of an individual or family

This is not a partisan thing, but a leftist would oppose this state constitutional amendment (it passed with 67.88% of the vote)