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Let's back up to before the first state in our primary season had their caucus--Iowa.
Before the Iowa caucus, and before the candidates' campaigns were in full force in Iowa---these national polls reflected an electorate that had not met the full force of any candidate campaigns.
People answering these polls were not really plugged into the political process. They barely knew the candidates. However, these national polls gave significant advantage to Hillary because she was the "inevitable" candidate for more than a year and because of her name recognition.
So then...the candidates begin campaigning in Iowa. The Iowa polls reflect the national trends at first (Clinton leading, other candidates lagging), but as the campaigns go into hyperdrive, shifts happen and the race tightens. I live in Iowa and you could watch Hillary trend downward daily and Obama and Edwards trending upward. However, the national polls still reflected the "pre campaign" mentality--Hillary in strong leads.
In Iowa, Obama won, Edwards was 2nd and Hillary third. Simultaneously, the national polls still reflected Hillary in the lead.
Then, we go to New Hampshire. Hillary's lead in that state eroded into a close Obama/Clinton race. Meanwhile the national polls show double-digit Clinton leads. Look at the national polls after Obama's blowout in South Carolina. Rasmussen and others were still showing Clinton double-digit leads.
As these campaigns enter these individual states--the races tighten and in many cases Obama garners leads. The national polls still contain a large contingent of people who are not "plugged in" politically because they haven't voted yet and because they haven't yet met the campaigns.
As the primary season progresses--you see the national race tightening--because the numbers of "plugged in" people are increasing--as more states have voted and have experienced the full force of each candidate campaign.
Does that make sense?
The local, state polls are the only polls that are relevant. They reflect the true impact of the campaigns, and how people will vote in imminent elections.
These national polls will fully reflect a plugged-in, informed, exposed-to-the-candidates mentality-- pretty much before the last state elections--when nearly all of those polled will have been exposed to each campaign. That won't happen for a while.
In the meantime, those state polls are the polls that really matter.
The national polls matter, as far as the long-term trends are concerned, but they still contain the opinions of many Americans, and those opinions will change after the campaigns land in their states and towns.
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