Aspen Daily News: A key issue in the Rocky Mountain West this political season is how to tap Western oil reserves that could be twice as large as Saudi Arabia’s — but are encased in rock. “At a time when Americans are screaming for energy independence, no policymaker can ignore that there are between 1 and 2 trillion barrels of oil shale and 800 billion barrels of oil equivalent to be recovered,” says Bob Schaffer, a Republican and former congressman who is running for Colorado’s open U.S. Senate …