PITTSBURGH -- Darrin Kelly, president of the powerful Allegheny-Fayette County Central Labor Council, says that not one of the Democratic candidates running for president has reached out to him to ask about or listen to what union families in western Pennsylvania are looking for in a nominee to challenge President Donald Trump in November. "Not one," he says abruptly. That omission is obvious in just about every proclamation about the energy sector coming from the mouths of most Democratic candidates, whether it is Sens. Bernie Sanders' and Elizabeth Warren's pledging to ban fracking, or former Vice President Joe Biden's recent...