Testimony in a lawsuit — from which she was eventually dropped — reveals the would-be first lady's passionate engagement in dressage, a sport she believes helps her deal with multiple sclerosis.It was the end of a long day in a stuffy Simi Valley office building. Ann Romney had been under oath for more than four hours, testifying in a sometimes contentious deposition about a pricey horse she sold that may or may not have been afflicted with a condition that made him unrideable.