CarMax co-founder and former CEO Austin Ligon, who will be a featured speaker at the Democratic National Convention, says he and his company's 17,000 employees aren't responsible for his billion dollar company, the government is: As President Obama has said, I didn't do it alone. I succeeded because we had a committed team of CarMax associates working round the clock to build our business. We found ready capital from healthy and flexible capital markets that allowed us to grow. We benefited from an effective national transportation infrastructure that let us move products from one market to another, and we had...