Why this Canada-U.S. pipeline has emerged as a midterm election issue in the U.S. Midwest

OTTAWA — A frightening scene played out on Tuesday morning, when a parked semi-truck rolled into an excavation site and hit an exposed section of the Enbridge Line 5 pipeline near the Wisconsin-Michigan border.Drone footage that was widely circulated online showed a thick, white cloud of natural gas spreading from the accident site to a meadow on the other side of a dirt road.While the leak was quickly isolated and no injuries were reported, the incident exacerbated an already tense polit