They're also discussing the possibility of a "reverse Bradley effect", in which people are afraid to admit to their peers that they will be voting for Obama (one can guess the reasons they don't feel free to be open about their support for Obama), and while they tell people they're voting for McCain, they will in fact, vote for Obama.

I heard some people say they think there will be a lot of people who do this. Obama said he thinks the two different effects will probably cancel each other out.