UPDATE: I've figured out where O'Connor is getting his number from.
Way back in 2010, I wrote a post about the final, official, report for Minneapolis' inaugural Ranked Choice Vote, conducted in 2009. It was an entirely boring election with entirely predictable results, and RCV did no worse or better than any other election method would in such a situation. The most-damning part of the report though, was how RCV seemed to have caused a quadrupling in the percentage of spoiled ballots, from 1.06% to 4.1% (see page 18 of the report.)
So imagine my surprise when I see in my RSS feed an OpEd from the Minneapolis StarTribune claiming that only one single ballot was spoiled. And imagine my further surprise when I see that it was penned by Patrick O'Connor, Minneapolis' interim elections director during that 2009 election, the same Patrick O'Connor mentioned by name (on page 1) of the very report that so grandiosely contradicts his statements published today.
Did Mr. O'Connor simply not read the report he commissioned four years ago? Or is he intentionally spreading falsehoods about it? I think Minneapolis deserves to know.