Governor Tom Corbett, who faces tough poll numbers when it comes to his hopes for re-election, formally launched his campaign in Pittsburgh, highlighting the state's Marcellus Shale industry as one of the key successes of his time in office.

"The energy industry in Pennsylvania is now supporting the livelihoods of over 200,000 people and their families who work in good-paying middle class jobs," he told the crowd.

But economists say that jobs number is questionable.

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