Hugo Chávez may be wondering, as Venezuela's taps run dry and its cities fall into darkness, whether God is on the side of the Yankees. The El Niño weather phenomenon appears to be taking sides as it parches leftist-ruled parts of South America and brings bounty to US farmers and corporations. One of the severest droughts in decades has given Venezuela's socialist president a political nightmare as hydro-electrical power dribbles to a standstill, unleashing blackouts, rationing and protests. The waters behind the Guri dam, which supplies more than half the nation's power, have touched perilously low levels. Chávez has declared...