The son of democrat vice presidential candidate Joe Lieberman has been campaigning in Iowa today. Thirty-three-year-old Matt Lieberman began his day at a Des Moines day care center to stress the Gore/Lieberman campaign promise to have universal preschool.Lieberman has taken a leave of absence from his job as a high school English teacher to campaign for his dad.Lieberman’s other stops were in Ames, Marshalltown and Indianola.