With a date of 8/3/08, what was the length of the victory margin?
{'header': ['Finish', 'Race', 'Distance', 'Jockey', 'Time', 'Victory Margin (in lengths)', 'Runner up', 'Track', 'Surface', 'Date'], 'page_title': 'Big Brown', 'section_title': 'Race Data', 'caption': 'Race Data', 'rows': [['1st', 'Maiden', '1 1⁄16 mi', 'Jeremy Rose', '1:40.33', '11 1⁄4', 'Dr. Cal', 'Saratoga Race Course', 'Turf', '9/3/07'], ['1st', 'Allowance', '1mi', 'Kent Desormeaux', '1:35.66', '12', "Heaven's Awesome", 'Gulfstream Park', 'Dirt', '3/5/08'], ['1st', 'Florida Derby', '1 1⁄8 mi', 'Kent Desormeaux', '1:48.16', '5', 'Smooth Air', 'Gulfstream Park', 'Dirt', '3/29/08'], ['1st', 'Kentucky Derby', '1 1⁄4 mi', 'Kent Desormeaux', '2:01.82', '4 3⁄4', 'Eight Belles', 'Churchill Downs', 'Dirt', '5/3/08'], ['1st', 'Preakness', '1 3⁄16 mi', 'Kent Desormeaux', '1:54.80', '5 1⁄4', 'Macho Again', 'Pimlico Race Course', 'Dirt', '5/17/08'], ['9th', 'Belmont Stakes', '1 1⁄2 mi', 'Kent Desormeaux', 'N/A', 'N/A', "Da' Tara (1st)", 'Belmont Park', 'Dirt', '6/7/08'], ['1st', 'Haskell Invitational', '1 1⁄8 mi', 'Kent Desormeaux', '1:48.31', '1 3⁄4', 'Coal Play', 'Monmouth Park', 'Dirt', '8/3/08']]}