Webster City, Iowa (CNN) - As Newt Gingrich denies he was paid to lobby Republicans for mortgage giant Freddie Mac, fellow Republican presidential candidate Michele Bachmann on Wednesday challenged Gingrich's denial. "Whether former Speaker Gingrich made $300,000 or whether he made $2 million, the point is that he took money to also influence senior Republicans to be favorable toward Fannie and Freddie," Bachmann said after a campaign event in Webster City, Iowa.