Seattle Mayor Katie Wilson laughed and seemed to encourage the notion that millionaires could leave the state of Washington while discussing her support for a progressive tax during an interview earlier this month. “I think the claims that millionaires are going to leave our state are, like, super overblown. And if — the ones that leave, like, bye,” she said, which prompted cheers and laughter from the audience at the Seattle University event, Seattle University Conversations, which took place on April 14. Wilson was asked if she believed progressive taxes were an “easy” and “promising” solution to the tax climate in the area. She said she never thought they were easy, but said she was excited about the millionaire tax that passed in the state. “In general, we still have the very regressive tax system, and my office is doing a lot of work to look at what our options are in terms of progressive taxation,” she said. “We do have more flexibility at the city, at the county, in terms of our taxing authority.…