There was no Bradley Effect in Iowa. The polling average gave Obama 54%. He got...54%. He never had outside the MoE in any recent polls. There was no mass lying to any pollster saying they would vote for Obama who then went to vote for McCain.
Technically people saying they're undecided but really not could be counted as a B.E.
However, it's asinine to assume this isn't just due to poor weighting or leaners dissatisfied with McCain (he wasn't popular in the caucus if you remember). Especially when it doesn't show up in other states with similar demographics!
Exactly. There's a million reasons why polls could be off or undecideds can break heavily, etc. But try telling that to J. J., who basically argues any discrepancy in McCain's favor MUST be the Almighty Bradley Effect.