A gambler lives in a state where gambling was illegal. Nevertheless, he gambled on a regular basis. He asked his friend to lend him $5,000 to bet on a football game. His friend agreed to lend him $5,000 if the gambler would bet half of it on the friend's behalf. The gambler agreed, took his friend's $5,000, and placed the bet. The gambler won on 4-to-1 odds. He gave his friend his $5,000 back but refused to tender any winnings.

a.If his friend sues the gambler to recover the winnings due under the contract, who will prevail?