Dave Johnson is an American announcer and sportscaster, best known for his work in horse racing with ABC Sports and at various race tracks in New York and New Jersey. His signature line — "And "down" the stretch they come!" — is instantly recognizable throughout the sport, and often imitated by comedians, notably David Letterman. From 1972 to 1977, Johnson was the public address announcer for the tracks of the New York Racing Association. Wikipedia
The definitive Wikipedia entry for Dave Johnson. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Dave_Johnson_%28announcer%29