First, because obviously all of the other candidates have determined that their hopes rest entirely on attacking Chow, and attacking her on this specific point about potential tax increases. Now it seems just as likely Chow cruises to victory without the levels of support ever really changing. And that leads to my third observation about that moment, and the state of the campaign so far: Olivia Chow has succeeded thus far, to a certain extent, by avoiding being pinned down to specifics. The point here is that so far, a growing plurality of people seem to be ready to vote for Chow based on liking and trusting her. Asking the same question over and over and expecting a different response just seems, past a certain point, silly.