What is a low poll rating for a politician?

Generally accepted political polling began in the mid-1900s. Truman set the Gallup low for presidents, dropping to 23 percent in 1951 and early 1952. Carter slumped to 28 percent in 1978, and Nixon was at 24 percent when he quit in 1974. . . . .

A database maintained by the University of Rochester, University of North Carolina at Chapel Hill and George Washington University lists 3,261 gubernatorial polls since 1958. Only three governors had an approval rating below 15 percent - none in the past 15 years. . . .