Youbet.com Inc. Chairman and CEO Charles Champion will leave the online horse wagering firm in December. Champion steps down from leadership of the Woodland Hills-based company to pursue other opportunities. Youbet COO Gary Sproule has been named as interim CEO until a permanent replacement is found. Champion helmed Youbet during a turnaround in the company’s core business. The company’s wager processing through organic growth and acquisition advanced from $110 million to $750 million between 2002-06. Champion also helped launch innovating marketing programs such as Youbet Advantage and customer protection programs such as Players Trust.