Federal funds could begin running dry Saturday that help tens of millions of Americans to buy food for their families and send their toddlers to preschool if Congress doesn’t reach a deal by then to end the U.S. government shutdown . Funding for another program that helps mothers care for their newborns could run out the following week. Barring a resolution to the shutdown, the U.S. will have a gaping hole in its safety net, particularly for the Supplemental Nutrition Assistance Program, which