DAYTONA BEACH, Fla. – With the NASCAR season revving up at Daytona International Speedway this week, companies still have a chance to associate themselves with the sport's most popular driver, Dale Earnhardt Jr. And they can do so at the relative bargain-bin prices found in NASCAR's second-tier Nationwide series. In happier economic times a few years ago, the possibility of such a deal would have triggered a stampede of potential sponsors tradin' paint with briefcases as they raced from the boardroom to the track. But as of this week, the Earnhardt family's JR Motorsports team had sponsorship contracts in hand...