Dale Earnhardt Jr. thrills, then fades in Las Vegas

He leads for 70 laps in the Kobalt Tools 400, but a tire change drops him back and he finishes 10th. He is fourth in Sprint Cup Series points.

Reporting from Las Vegas -- NASCAR's Dale Earnhardt Jr. gave his many fans a thrill Sunday by taking the early lead at Las Vegas Motor Speedway, but he couldn't stay in front.

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