The Norwalk Inn was the site this afternoon of the second of four scheduled debates between second-term Democratic US Rep. Jim Himes and Steve Obsitnik, his Republican challenger. The hour-long event, sponsored by the Greater Norwalk Chamber of Commerce, the Business Council of Fairfield County, the Bridgeport Regional Business Council and News 12 Connecticut, will first air tonight at 9 on Channel 12 for TV viewers in southwestern Connecticut. Moderated by News 12 Connecticut’s News Director Tom Appleby, the debate included questions from Jerrod Ferrari of The Hour Publishing Co., Patrick Gallagher of the Fairfield Business Journal and Ken Dixon of the Hearst Connecticut Newspapers. The debate will also be shown at other times during the weekend.