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Fans cheer as Daytona 500 winner Dale Earnhardt Jr. arrives for a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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Daytona 500 winner Dale Earnhardt Jr., center, arrives for a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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Daytona 500 winner Dale Earnhardt Jr. climbs out of his car as he arrives for a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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Fans cheer as Daytona 500 winner Dale Earnhardt Jr. speaks during a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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A fan of Dale Earnhardt Jr. stands with a model of the recent Daytona 500 winner's car during a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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Fans cheer as Daytona 500 winner Dale Earnhardt Jr. arrives for a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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Daytona 500 winner Dale Earnhardt Jr. talks to fans during a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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Daytona 500 winner Dale Earnhardt Jr. talks to the media during a victory tour stop, Tuesday, Feb. 25, 2014, in Austin, Texas. Earnhardt won his second Daytona 500 Sunday. (AP Photo/Eric Gay)

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A worker uses hand signals to communicate with a co-worker over the sound of massive pumps at an Encana Oil & Gas (USA) Inc. hydraulic fracturing and extraction site, outside Rifle, in western Colorado. Environmentalists are still waiting for proof that hydraulic fracturing makes people sick, but that's not stopping them from whipping up anxiety over public health. (Associated Press)