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NASHVILLE, Tennessee (Reuters)

Democratic presidential candidate Barack Obama has a slim 2-point lead on Republican rival John McCain in a tight White House race, according to a Reuters/C-SPAN/Zogby poll released on Wednesday.

And the important words – which in this article are in the second paragraph, not at the end like CBS did

Obama led McCain by 47 percent to 45 percent in the national poll, within the margin of error of 2.8 percentage points. (or 3.1 if you go at the poll)

So, for those of you wondering about the differences between those polls and the others: the key is in the sampling. And no, this poll doesn’t disclose the sample either.

All I could find here was that the margin of error was actually even larger than the article says

Telephone survey of likely voters nationwide was conducted September 11 through September 13 and included 1008 interviews with likely voters. The margin of error is +/- 3.1 percentage points. Numbers may not add up to 100% due to rounding.