But precedented. This is how STV was removed from West Hartford, CT in the early 1920s -- and therefore banned from further adoption in Connecticut. (A 1939 adoption effort in Waterbury required special permission from the legislature.)
In CA and MI, it was the courts, removing STV from Sacramento and Kalamazoo. In OH, on the other hand, the courts were favorable.
In MA, the legislature eventually repealed the STV local option. As far as I can tell, this is because support from breakaway Democrats evaporated. Cambridge survives via grandfather clause.
In other states (RI and I think NJ), PR was preemptively banned via constitutional amendment.
In 1938, New Yorkers defeated a constitutional amendment to remove STV from NYC and ban all further PR implementations, of whatever form. I have not yet analyzed those returns, but stories suggest it was the partisan balance of forces that defeated the proposal: the ALP and NYC Republicans versus NYC Democrats and Republicans from upstate. See: Zeller and Bone (1948).
The MN bill is the work, so far, of three Republicans and one Democrat.
What endangers IRV in Maine are the votes of 11 Democrats in the lower chamber, who broke with their party on October 23 and joined Republicans to postpone implementation. The division was 68 for, 63 against.