Former Mayor Rudy Giuliani refused to renew his support for Jeanine Pirro's scandal-hobbled campaign - and ducked questions on how his firm received a no-bid contract.....Giuliani dropped a fund-raiser and was asked if he was still backing her....."Oh, jeez," he laughingly responded. "We're not here to talk about that today," he continued - refusing to say anything further. Giuliani's dodge came just hours after The Post disclosed that in 2004, Pirro steered a no-bid contact to Bernard Kerik and Giuliani's security firm.....rebuffing protests from one of her aides and from A & P, which was forced to pay for it....