In a phone call with reporters ahead of his visit here Wednesday evening, Sanders said that about 9,500 people have rsvp’d saying they would attend his rally at the Alliant Energy Center. If that crowd materializes — and there is an “if” there — Sanders said it would the biggest who have turned out so far to hear him talk about addressing the income gap between America’s rich and poor, raising the national minimum wage to $15 an hour, and bringing more skepticism to international trade deals.