The Known Unknowns
By BOB HERBERT
Published: November 1, 2008
....There are many reasons why Senator Obama, or any other candidate, might do better or worse on Election Day than polls suggest. Respondents lying to pollsters is probably the least likely among them.
Turnout is the big wild card this year. Frank Newport, editor in chief of the Gallup Poll said that trying to gauge the size of the turnout and decipher its meaning “is probably the No. 1 challenge we’re looking at.”
An exceptionally high turnout probably plays to Mr. Obama’s advantage. It would indicate that large numbers of newly registered Democratic voters, including blacks and younger voters, were showing up in droves. With a better-organized ground operation than the McCain campaign, and with lots more money to spend, the Obama forces should have an easier time getting their voters to the polls.
A huge overall turnout could also be a sign that economic anxiety has become so great across the electorate that it trumps the concern that many voters might have about Mr. Obama’s race.
A potential pitfall for Mr. Obama is the danger that voters who have not expressed a preference to pollsters end up voting heavily for John McCain. Those voters could shift the balance in potential swing states, especially those states where Mr. Obama is ahead but is not polling above 50 percent.
There is some evidence that lower-educated, less affluent white voters — a group that tends to favor Senator McCain — may be somewhat more reluctant than other groups to respond to pollsters.
The Bradley effect may not be real, but race in this election looms large. The question that will be answered Tuesday is whether a bad economy looms even larger.
http://www.nytimes.com/2008/11/01/opinion/01herbert.html?hp