ERIE, Pa. – Grilled chicken breast, baby tomatoes and couscous were served for lunch at the 2024 Shale Insight Conference this week. So was Democratic Sen. Bob Casey. For three days, oil and gas workers from Pennsylvania, Ohio and West Virginia gathered in Erie to network and discuss the future of their industry, from new drilling technology to geopolitics. The senator and his Republican challenger, Dave McCormick, both made their pitches in this northwestern Pennsylvania center Thursday to the fracking industry, which is vital to the economy in the battleground state. A swath of recent polls finds McCormick closing in on…