Speaker Newt Gingrich says he is considering the novel idea of taking testimony on the House floor in the campaign fund-raising investigation. If Gingrich is proposing the maneuver to irritate the Democrats, he is succeeding. "That will be the beginning of the end of any hope that the House can pass anything resembling a substantive agenda for the year," said Laura Nichols, spokeswoman for Democratic leader Dick Gephardt. In a brief interview Thursday, Gingrich said he is researching whether there is any precedent for conducting an investigation in the chamber, where all sessions are televised on C-Span. The speaker said the maneuver could be "an educational experience."