Arrow's impossibility theorem makes a mistake with the concept that there are ever irrelevant alternatives. Of course it matters who else is on the ballot. By making that a requirement, it forces the concept of impossibility, but it is only because of a constraint that is too severe.

Too hard to find the problem if you don't keep track and allow a means to compare ballot by ballot. See http://openballotinitiative.or... The problem is that you WILL have differences between the interpretations.