America's attitude to race has changed: how much it has changed will be measured by the Bradley Effect, or lack of it.

美国对于种族的态度已经改变了：改变了多少则将由布莱德利效益来衡量，或者说用它的减少来衡量。

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The latest evidence - anecdotal, statistical and historical - suggests that although the ghost of Bradley still hovers over the election, its effect is diminishing.

最新证据——轶事的，数据的和历史的——显示出虽然布莱德利的乌云依然笼罩在这次大选上，但它的影响正在减少。

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Obama even slightly reversed the Bradley Effect by outperforming the poll predictions in the 2008 election.

FORBES: Does the Bradley Effect Overrate Obama in the Polls?

So why do I suspect the Bradley Effect will return in 2012?

FORBES: Does the Bradley Effect Overrate Obama in the Polls?

In the past 15 years or so, there's been no indication in the polls that the Bradley effect has been a factor in statewide races.

CNN: Will Obama suffer from the 'Bradley effect'?