i just saw on 60 Minutes that the use of Cloned Horses is allowed in Argentinian Polo. 
I figure US harness racing can't be far behind.  
But it will be, of course, larcenous. 
I'm thinking somewhere on the back lot of a Takter farm, there is tucked away a yearling or 2 year old perfect copy clone of Always B Miki, with a phony name and phony paperwork. 
It almost HAS to be true.