In this continuing series, we examine the past winners of significant filly/mare races by the lasting influence they've had on the breed. Up today is the GI Spinaway S., currently the first Grade I of the year for 2-year-olds in the country. Dating to 1881, back when the Kentucky Derby was running for just the seventh time, President James Garfield was assassinated in office, and there was what would become a legendary shootout at the O.K. Corral, the Spinaway has seen its share of history. The race itself is named...