Unions are putting the pressure back on Verizon to come to a new labor agreement by midnight tomorrow or else the communications giant will be facing a walkout next week from 65,000-plus workers. The original deadline for a new contract came and went last weekend with the Communications Workers Union agreeing to hold off on a strike. But labor leaders accuse Verizon of "dragging its feet" on the last few sticking points and gathered at picket lines yesterday in Downtown Manhattan, Garden City and Port Jefferson. Verizon reps were surprised by the new deadline, saying they had been "making good progress at the bargaining table."