i think he underestimated Biden that he wouldn't win at anything. He had become shortsighted that he didn't look at some of the facts that might have helped him make a better decision. Anyways, what already happened has happened, no turning back. I agree that he is not a sore loser, unlike the one who lost 
He did not have any plan B.
What other plans can you have in gambling? It's only Win or Lose. No other plans involved, lol.