Pleading that he is pressed for time,House Speaker Newt Gingrichsaid he will step down as chairman of GOPAC, the cash-stuffed political action committee he used to help engineer theRepublican landslide last November. Since the GOP victory, the PAC has come under scrutiny for not disclosing information about donors and has beenthe subject of an ethics complaint. Gingrich's resignation is his latest move to trim his calendar and lower his profile. Earlier this week, he discontinued the Speaker's traditional daily press briefing. He has also stopped teaching a controversial weekend college course.