Clean Move or Dirty Play?

[packerbacker7964]

Your in a Handicapping Contest that pays $100 grand to the winner. Your plays are over and you have a $20 or so dollar lead. The only person who can catch you has a play in the last race with a longshot. Do you try and bet a couple grand on it to make it pay less if it wins to secure your win or just let the race play out. I'd consider playing a 1k or 2k on it myself just to see if the odds would change any in my favor.