What I have retained from my undergrad and graduate stats courses is this: if you take a big enough look at the numbers, they very seldom lie.
Opinion polls are at best abstratct exercises in answering only the question of what people will answer when a pollster asks them a question. BUT- if you look at an aggrearate of results, time over time greater truth can be apparent.
The presidential polls in the U.S. show that Barack Obama has a near lock on the race. You can't possibly lose if poll, after poll says you have a lead and you are going to win. Barring the greatest of scandals and falls from grace he has this race locked. Look for yourself:
http://en.wikipedia.org/wiki/Opinion_polling_for_the_2008_United_States_presidential_election#Two-way_contest:_Barack_Obama_vs_John_McCain
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