Purdue (2-4, 1-2 Big Ten) at No. 23 Iowa (4-2, 1-2), Saturday at 12 p.m. EDT (ESPN2). Line: Iowa by 17. Series record: Purdue leads 48-38-3. WHAT’S AT STAKE? Iowa needs to build some positive momentum after suffering back-to-back close losses to ranked teams. Purdue blasted Maryland 40-14 last week, and a win over the
