The Institute of Government and Public Affairs presents a public forum, "The l 996 Presidential Election: Winning at the Expense of Ethics?," from 9 a.m. to noon April 25 in the IGPA conference room. James D. Nowlan, IGPA Senior Fellow, moderates the forum. Featured speakers, and their topics: Shanto Iyengar (UCLA), author of "Going Negative: How Attack Ads Shrink and Polarize the Electorate," will discuss "Negative Ads: Do They Work? At What Cost?" The Hon. Nancy Kaszak, member of the Illinois General Assembly, speaks about "Ethics and Campaigns: A View From the Trenches" Clarence Page, Pulitzer Prize-winning Chicago Tribune journalist-columnist, will discuss "The Role of the Media." Samuel Popkin, an expert on surveys and author of "The Reasoning Voter," will talk about "Can Polls Serve Questionable Ends?"