UNITED NATIONS (Reuters) - U.S. Sen. Patrick Leahy, visiting the United Nations, cautioned his Congressional colleagues to "take a deep breath" before making a political football out of the world body by withholding dues. Leahy, a Vermont Democrat, said he disapproved of moves by several Republicans to withhold U.S. payments unless the world body fully cooperates with Congressional probes into the oil-for-food scandal in Iraq. "I think we ought to take a deep breath. This is not a time to make a political football out of the U.N.," Leahy told reporters after seeing U.N. Secretary-General Kofi Annan. "We need them...