Hoy el nyt dedica un artículo al efecto Bradley para decirnos que ni sí, ni no, ni todo lo contrario.

Lo más interesante de la reflexión es la referencia a un estudio realizado en Harvard:

Daniel J. Hopkins, a postdoctoral fellow at Harvard, considered 133 elections between 1989 and 2006 and found that blacks running for office before 1996 suffered a median Bradley effect of 3 percentage points. Blacks running after 1996, however, performed about 3 percentage points better than their polls predicted.