Not true in either case. What is true in 2010 is that there was a lot of divergence among the polls, though ALL of them showed that the Republicans were going to beat the Democrats--it was just a matter of by how much.
Here's an article from just before the election. The models and methods are not in general screwed up, and when something really IS amiss, then it becomes apparent because the polls begin to diverge and show disparate results. This is a red flag by which they, along with everybody else, recognize that the results are not very reliable, and they all start scrambling to figure out what's up and make corrections. When all the polls show pretty much the same thing--as they do now--it's almost always right.
Wrong. The polls are NOT broken--or at least, neither your nor all the other critics have any way of knowing whether they are, but there's no particular reason to think so (other than people don't like the results). The polls are really very good. Yes, it's hard to sample properly, but over the last half century there has been a lot of resources poured into the problem, and continue to be, and as a result they have become astonishingly good at it. I don't think you can point to an election in the last couple of decades where there was consensus about the results and the pollsters were caught flat-footed and wrong.
As it happens, I do remember one case where this did happen: in 1982 the black LA mayor Tom Bradley led the gubernatorial polls over then-Attorney General George Deukmejian by a substantial margin, but lost the election. The theory--as far as I know, still the only explanation anybody has offered--is that a lot of white people were unwilling to say that they were going to vote against the black candidate. This phenomenon/theory actually has a name:
the Bradley effect. So if you're looking for some hope that the polls are wrong, there's a possibility. However, I don't believe that this effect showed up in 2008, so there may not be a lot of reason to think it will happen this year, either.
Oh, by the way: Fox News polls show rather the same results as the others. So those who postulate that the polls are being deliberately skewed to help Obama had better go hunting for the moles over at the official Republican network.
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