NPR's Peter Kenyon reports on final efforts in the Senate to pass President Clinton's request for beefed-up anti-drug aid to Colombia. The Senate beat back efforts last night to sharply reduce the President's request. Today it passed a 934-million-dollar aid package. But some lawmakers remain hesitant, citing fears about getting involved in the civil war enveloping Colombia. The South American nation is currently battling an insurgency from leftist guerillas, who have formed an alliance with the country's drug traffickers.