The coverage of the NYC primary, in which Zohran Mamdani is leading, makes me think that journalists wrote explainers about the ranked voting and then completely forgot about it.
***You don't know that Mamdani has won, even if he's leading in first-position votes!***
With ranked voting, it's not uncommon that the first-round leader ends up not winning. Take a look at page 9 of this PDF, the voting stats for last year's Hugo Awards:
https://www.thehugoawards.org/wp-content/uploads/2024/08/2024_hugo_statistics.pdf
In this vote for Best Novella, SEEDS OF MERCURY leads the first round with 881 votes, and the eventual winner THORNHEDGE only has 593 votes. But as No Award and the lower candidates get eliminated, SEEDS OF MERCURY's vote total doesn't shift much while THORNHEDGE's just keeps climbing.
In the NYC election, it's certainly plausible that the 11% of votes for Brad Lander will have Mamdani as the second choice and put Mamdani over 50%, but you don't know that for sure! He shouldn't be declaring victory, and Cuomo shouldn't be conceding.