JEFF GREENFIELD ANCHORS. Need to Know airs a special edition from Tampa, the site of the GOP national convention. Host Jeff Greenfield will report on Republican efforts to carry Ohio, a state deemed critical to their chances of winning. The New Yorker staff writer John Cassidy, who has written extensively about politics and the economy, is interviewed. Greenfield also contributes an essay about Ohioans who became president - often with disastrous results.