In the 1940s, Margaret decided she wanted to be a singer. When she debuted on the radio in March1947, a music reviewer criticized her voice. This led to an infamous incident in which Harry Truman threatened to punch the reviewer in the nose. Despite the bad press, she received many jobs on radio and television variety shows well into the 1950s.
She was married to reporter Clifton Daniel, who would later become an editor at the New York Times, from 1956 until his death in 2000. They had four children.
Starting in 1980, Margaret wrote mystery novels, revolving around murders in the nation's capital. Many of her novels have become bestsellers.