Short answer: No.
I put together the following chart that includes 1) the RCP average lead for Obama, and the Daily Kos/Research 2000 average nightly lead for Obama. Some notes: 1) The R2K poll is shifted one day before the release date so that it matches the night the polling was done. And yes, I know Daily Kos numbers are bogus -- they don't intersect the RCP average once and show a +30 point favorability advantage for Obama over McCain (WTF?), when RCP shows +8. But they do show trends, and are the only ones that release nightly numbers, useful in pinpointing when shifts occurred. 2) RCP is shifted three days back, one day back to match R2K, and then two days further back to reflect the median date on which the polling was done to make it as much of an apples-to-apples comparison as possible.
What the chart seems to indicate is that Palin's network interviews were either not a factor, subsumed by other ginormous developments (e.g. the financial crisis and the debate). The blue line is the RCP lead and the red line is R2K:
Palin's Charlie Gibson interview was released on the night of 9/11 and the impact likely would have been felt on the 12th and 13th. Though this was a period in which the McCain bounce was undergoing natural slippage (not to mention the Fannie & Freddie collapse on the 7th), R2K shows McCain moving back into the lead on the night of 12th before Obama took the lead on the 13th. Given how pro-Democratic the R2K poll is, perhaps this was a temporary 9/11 anniversary effect.
Both R2K and RCP show Obama's numbers accellerating starting on the 13th and 14th, with him moving into an outright lead in the RCP average, culminating in a new plateau for Obama on the 15th. That was the weekend in which Merrill was sold and Lehman Brothers collapsed. This is generally considered to be the point the financial crisis began in earnest.
The next relevant milestone was the AIG collapse and the Paulson Plan announcement on the 18th and 19th. R2K shows this as the beginning of a slight McCain revival, while the RCP seems to indicate this augured in a period of continued slippage which lasted through the 25th.
Palin's Katie Couric interview made news on the 25th.
Indeed, Obama did jump from a 4 point lead on the 25th to an 11 point lead on the 28th and 29th, inflated numbers which haven't yet been fully factored into the RCP tally. But what else happened here? Umm... the first debate. Could it be that a debate watched by 52 million people where Obama is generally seen to have done well could have had more of an impact than a network interview news of which was probably buried by that first debate -- not to mention McCain's abrupt reversal on attending?
So, to sum up, the most important impacts on recent polling were:
- The Lehman/Merrill collapse (9/13-14)
- The first debate and fallout (9/26-28)
- The AIG bailout (9/18)
I don't see Palin on the radar screen of any of this. And I'd trust these numbers more than I'd trust the op-ed elitists.