But what about the so-called "Bradley Effect" in which survey respondents are known to mislead pollsters on certain issues and candidates due to a "social desirability bias" (i.e. they don't want to appear prejudiced against, say, gay or black people)? For example, in 2009 the Washington Poll predicted that R-71 (domestic partnerships) would pass by a 17-point margin. It actually passed by only 6.3 points.