How could looking at a poll help you determine an inherently unpollable variable? Do explain.
You look at the results and compare them with the polling. I want to see if the poll is off and by how much.
For example, if Obama wins by within two points, we could conclude there wasn't a positive B.E.
If McCain wins by three points, we might be able to conclude there was a slight B.E.
Based on the poll (the poll is garbage, but that's irrelevant), a McCain victory of three would be MoE, not Bradley Effect.
