NASHVILLE -- On a spectacular afternoon of racing at the 72nd annual Iroquois Steeplechase, Jacqueline Ohrstrom’s Demonstrative edged past Divine Fortune at the finish line to win Saturday’s $150,000 Calvin Houghland Iroquois (Gr. 1) by a head. Molotof, owned by Calvin Houghland’s widow, Mary Ann, finished a distant third in the richest race of the National Steeplechase Association’s spring season.Demonstrative and Bill Pape’s Divine Fortune completed the 2012 season in the same respective positions, with Demonstrative a length in front of Divine Fortune after a heady run through the stretch of the $100,000 Marion duPont Scott Colonial Cup (Gr.