Forget about a candid national conversation on energy. As John McCain and Barack Obama campaigned last week, that much seemed clear. To lower oil prices (which were already dropping), Obama proposed releasing 10 percent of the Strategic Petroleum Reserve. This is an atrocious idea. The SPR was intended as insurance against a catastrophic loss of oil from wars, embargoes, terrorism or natural disasters. It should not be manipulated cynically for political advantage. Earlier, McCain suggested suspending the 18.4-cent-a-gallon federal gasoline tax; that was another bad and expedient idea.