IMSA GTD Champion Christina Nielsen is the first woman to win a championship in a major U.S. racing series. It wasn’t a lucky win. She came within two points of the championship last year. Nielson is one of the top sport car drivers in America, male or female. It’s hoped the historic win that came at the IMSA season ending Petit Le Mans event at Road Atlanta will knock down the glass ceiling keeping more women from chances at a championship. Listen…