Newt Gingrich isn't about to let his business past thwart his rise in the GOP polls. Responding to a report from Bloomberg News that said the former House speaker banked between $1.6 million and $1.8 million consulting for Freddie Mac, Gingrich told reporters in Des Moines on Wednesday that he "did no lobbying of any kind" and welcomed an investigation. "Everybody will dig up everything they can dig up," he said. "That's fine. They should." He reiterated what he has said in the past about whether he was hired at the company to build bridges to Capitol Hill, saying only that he offers "strategic advice for a lot of different companies."