Letting go: Why holding onto grudges can be damaging

Studies have shown that people who hold grudges have greater levels of cardiovascular trouble, and higher levels of depression and anxiety. But according to one survey, four out of five adults harbor some lingering resentment towards others, sometimes over the smallest of reasons. Correspondent Susan Spencer talks with experts about why some people can maintain grudges for years; how holding grudges can be counterproductive; and what it takes to have forgiveness overcome lingering ill will.