I am one of the Liberals bobvis calls out:
During the primaries and shortly after, I heard a number of people (liberals) say that Barack Obama would not be elected because when it comes down to it, the Americans are just racist. People will say that they like his ideas and will vote for him, but once they go to the voting booth and ask themselves whether they want the old, white guy or the black dude, they just aren't going to vote for the black man. Some said 'Obama must build a substantially large lead' to hope to avoid the Bradley Effect in November.
These are falsifiable predictions.
If Obama is elected, will they revise their beliefs to account for the evidence that disconfirms their prior beliefs?
I will happily admit to being wrong about Obama back in January of this year. I honestly didn't think he had a hope of beating the Republican nominee. However, a well run campaign, a tanking economy, and many, many Republican mis-steps put him over the top. In fact, I am not even sure about the Bradley Effect holding true in this election. RealClearPolitics gave Obama a 7.5% edge over McCain on November 4th, and the actual spread according to Fox--52.35% Obama vs. 46.35% McCain--came in a bit below that (5.99%). Can this be attributed to anything in particular? I don't know. Certainly, if there is was a Bradley Effect in play, it was a very small one.