The U.S. presidential campaigns both have their eyes on the critical swing state of Pennsylvania — and Pennsylvania, as ever, has its eyes on energy. The state is the nation’s second-largest producer and exporter of fuels for energy — mostly natural gas and coal. The future of those industries is sufficiently important to the state’s voters that one of Vice President Kamala Harris’ first political decisions as a presidential candidate this summer was to drop her support for a ban on fracking.