The chief executive officer of Indianapolis-based MainGate says a new merchandise agreement with International Speedway Corp. (Nasdaq: ISCA) builds on the company's roots. The multi-year agreement gives MainGate exclusive rights for trackside and online merchandise sales at all racing events held at ISC's 12 race tracks throughout the country. The first event under the new partnership will be The Rolex 24 At Daytona in late January. In an interview with Inside INdiana Business...