MOORESVILLE, N.C. (AP) -Dale Earnhardt Jr. will leave the company founded by his late father at the end of the year in a shake-up certain to ignite a bidding war for NASCAR's most popular driver. He told Dale Earnhardt Inc. on Thursday that he had decided to make the switch to another team when his contract expires. "We worked really hard, but we were never close,'' Earnhardt said of negotiations with DEI. "I am a little sad, but I am trying to remind myself to be excited about what's ahead.'' Earnhardt had asked for 51 percent ownership of the team...