What a difference a day makes — and a counterthreat. On Friday, Nancy Pelosi bragged to TPM’s Brian Beutler that she had access to “a thousand pages†of investigatory material on Newt Gingrich, implying that she would “talk†later in the campaign if Gingrich won the nomination. However, after Gingrich blasted her a few hours later and called for an ethics probe into Pelosi’s threat, her office suddenly developed a case of amnesia about those thousand pages: House Minority Leader Nancy Pelosi now says she is not sitting on a trove of opposition research on former House Speaker-turned-GOP presidential...