Betty Anne Ward McCaskill died Monday after a long struggle with heart and kidney problems. The Democratic senator stopped campaigning last week while her mother was ill.
McCaskill's voice seemed to break Wednesday at a news conference as she admitting feeling "a little lost," but said her mother, even on her death bed, was offering campaign advice and urging her to go on.
McCaskill spoke outside a St. Louis County grade school about the importance of the school lunch program, noting that Republican opponent Todd Akin was one of just five lawmakers to oppose funding.
Akin was campaigning with former House speaker and presidential hopeful Newt Gingrich.