A former congressional press aide was arrested yesterday for allegedly maintaining an "intelligence relationship" for several years with U.S.-based spies for Saddam Hussein before the Iraqi leader was ousted. Among other activities, authorities said, Susan Lindauer, 41, cooperated with Iraqi intelligence agents in January 2003 by delivering a letter to the home of a distant relative, White House Chief of Staff Andrew Card, urging the Bush administration to hold off its invasion of Iraq so weapons inspectors could continue their work. Lindauer, a former journalist, worked in the late 1980s for the Seattle Post-Intelligencer and The Herald in Everett. Lindauer,...