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The national or state polls are designed to measure overall voter preference and sentiment. As such, they are general.
The internal polls are crafted for more specific goals. For instance, if you want to know the best demographic to campaign for in Texas, you can craft an internal poll which tests several of your ideas against those demographics. Hypothetically, say, you can do a poll which shows that your opponent has strong support amongst under 40 white females (or whatever, just a hypothetical), but that his support amongst Hispanic males is weak, and if you campaigned on issues strong to them, you might pry enough votes away to win the state.
So the internals are more specific, and can be crafted to answer more specific questions. Also, since they aren't released to the public, you don't have to worry about hurt feelings. You can poll how many white people really won't vote for a black candidate, and you can poll what issues or phrases you can raise to heighten the racist feelings in similar voters. For instance, you can find that white independents think of African Americans as untrustworthy, or as Affirmative Action employees who are given rather than earning jobs, and so you can work seemingly innocent phrases into your advertisements to play on this. Stuff like "What do we really know about Barack Obama?" Or "He's the greatest celebrity in the world, but what has he really done to earn that status?" You can thus claim you aren't being racist, when you know good and well that you are trying to trigger racist fears that your polls show you should trigger to win.
So you use these internal polls to craft a strategy and to uncover trends that could help you, and then you create polls that take these results into account. National polls might miss some of these trends (especially where the so-called Bradley Effect comes in), or they might craft formulas that assume a certain demographic will vote one way, whereas your own polling shows that that demographic is a false grouping, and that it is really two demographics that you see split. So your formula would be more accurate (you think). Say, for instance, a poll showing that Hispanic males in Texas support Obama. A national poll might leave it at that and assume that their numbers are representative of all Hispanic males, whereas an internal poll may discover that in fact there are two distinct demographics being lumped as "Hispanic Male," and that one of those groups will not vote Obama, so that the poll results on the nationals are off.
Anyway, if McCain is claiming his internal polling shows a win, that's part wishful thinking, and maybe part optimistic polling. He may be seeing that the national formulas are outdated (in this election that wouldn't surprise anything, since there are so many firsts here), and that his internal polling shows that he is more competitive in certain areas.
Also, there's the southern effect. Truman beat Dewey, despite Truman being considered a joke and Dewey a shoe-in, because the South voted as a solid block for the Democrats. The South always votes this way, but it was harder to measure in the national polls in 48. Look at what's happening now. Everyone is focused on gender and race, and no one is considering regional aspects. This is the first election in a generation without a southerner on either ticket. If the Democrats win, it will be the first time since FDR in the 30s that we won without a southerner on the ticket. The South now votes Republican, and the only elections we win are ones where we split the South. So, what will happen in the South? The polls show some splits, but will that occur? The nationals are hesitant to delve too deeply into racist sentiment in the South, but will it cause a surge of McCain votes that the nationals are missing on election day? I think that's more debatable than we assume.
One more thing--not that anyone has read this far. There's no doubt that Obama's supporters are the most fired-up and committed, and McCain supporters are disappointed in him, but will that translate directly to votes? A hesitant vote is still a vote. So, on election day, it's arguably conceivable that a lot of Republicans who are polling as weak McCain supporters, or who are refusing to be polled at all, will walk into the polling booth, and their habits and their old racist beliefs will take over. They may hate Bush and not like McCain much, but they still might turn out in droves to defeat the Democrat, just because that's what they do. Internal polls could pick this up more than national polls, which ask more universal, less specific, questions.
I fully expect Obama to win easily. I'm just pointing out what McCain's numbers could be showing that could give him hope. I suspect his numbers give him some reason to hope, but that his certainty is just campaign posturing.
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