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Debunking the Bradley Effect

 

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There is little doubt Obama is losing some votes due to his race; a recent Associated Press survey suggested that as many as 6 percent of the electorate may be voting against Obama because he is black. But that's not what the Bradley effect is about. As long as those prejudiced voters are telling pollsters that they're going to vote for McCain, their sentiments will be reflected accurately in the polling. The Bradley effect emerges when voters tell pollsters one thing and then do another at the ballot booth.

So the question is why, if a voter does not intend to vote for Obama, would he or she feel compelled to lie about it? There are perfectly legitimate reasons not to vote for Obama; a voter who wanted to vote against him because of his race would have little trouble rationalizing his vote. If a voter felt compelled to lie to a pollster, he might tell them that he was voting against Obama because of his inexperience or his liberal politics—when, in fact, he was voting against him because of his race. But the pollster would still tally the vote correctly in the McCain column. By contrast, in cases where the Bradley effect existed, including Bradley's race itself, the black candidate was as much or more experienced than the white opponent. So voters found it harder to excuse their racism and may have misstated their voting intention to pollsters as a result.

This is not to imply that there aren't any relationships between race and polling errors. In a study I conducted of undecided voters at ++fivethirtyeight.com++,< http://www.fivethirtyeight.com/> I found that a majority (between 60-65 percent) of white undecideds broke for Clinton during the Democratic primaries. And essentially all black undecideds broke for Obama. (Clinton performed worse among blacks than could be explained through the behavior of undecided voters alone, suggesting the possible presence of a reverse Bradley effect.)

In this respect, however, the undecided voters weren't behaving any differently from decided voters, since Clinton had won a solid majority of whites during the primaries and Obama dominated among African-Americans. So we might be able to tell something by looking at the composition of undecided voters in a poll; if the undecideds are mostly older, non-college-educated whites, the smart bet is that the majority of them will break for McCain. If they're younger college graduates, most of them will probably go to Obama.

Even if McCain were to win a great majority of undecided voters—there is evidence that most of the undecideds come from strong McCain demographics—there are other polling artifacts that might serve to counteract this. For example most pollsters do not call cell-phone-only voters—a young, urban, Obama-friendly demographic. And most pollsters err on the conservative side with their turnout models, assuming that the composition of the electorate looks like 2004—when, in fact, there were massive surges in participation in the primaries among groups like young voters and Latinos, who will go mostly for Obama.

With so many "X factors" like race, cell phones and turnout, there is probably an extra margin of error this year. And polls aren't terrifically accurate to begin with. But there is no reason to conclude that the polls are systematically overestimating Obama's support; the reverse is at least as likely to be true. McCain, in all likelihood, will need to win this election fair and square—which means that he has his work cut out for him.

Nate Silver is the founder of FiveThirtyEight.com, which analyzes polling data.

© 2008

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Member Comments

  • Posted By: Nowforsomemoretruth @ 11/03/2008 11:01:56 PM

    The problem with Obama is a simple one. One association does not a radical make. But in Obama's case, the list of left-wing radical mentors and associates is seemingly endless, (Davis, Ayers, Wright, Khalidi , etc., etc.) with a new revelation practically every day. With that trend, a picture begins to emerge, and that picture is that Obama is as steeped, not in just left-wing political thought, but in radical left-wing economic and race ideology, to the same extent that Pat Robertson was steeped in the ideology of the radical Religious Right. I would not have voted for Pat Robertson for dog catcher, and for similar reasons, I will not vote for Obama.

  • Posted By: Krohn @ 11/02/2008 11:17:29 PM

    The Wall Street crisis was planned the night of Obama's meeting at Bill Ayres home to put Obama in The White House. Together they put a beautiful plan into place.

    This Strategy was first elucidated in the 1966 issue of 'The Nation' Magazine by a pair of radical Socialist Columbia University professors, Richard Andrew Cloward and Frances Fox Piven.

    David Horowitz summarizes it as:

    "The strategy of forcing political change through an orchestrated crisis. The "Cloward-Piven Strategy" seeks to hasten the fall of Capitalism by overloading the Government bureaucracy with a flood of impossible demands, thus pushing society into crisis and economic collapse.
    unquote

    Obama begin with ACORN by funneling millions into their organization. He then trained ACORN to stage protests in banks to force them to issue risky loans or they would be threatened to face racial charges. ACORN was trained to intimidate financial institutions into giving ???Ninja??? loans to people with NO assets, NO job and NO income, who couldn???t afford these loans.

    That caused the housing bubble two years ago it was by ACORN's actions they were able to destroy our credit system.

    As this played out, D-Barney Frank and D-Chris Dodd were able to cover up the millions of improvident loans to these bad risky house buyers. And Barney Frank and his chums successfully were able to block all of President Bush's attempts to put a rein on this problem.

    So Fannie & Freddie was forced to purchase all these failed subprime mortgages.

    Then both Frank and Dodd denied that there were any problems, and refused the Bush Admin. requests to set up a regulatory agency to watch over Fannie Mae and Freddie Mac, and they were still pushing for these agencies to go even further in promoting sub-prime mortgage loans almost up to the 'minute they failed'.

    Democrats then blamed Bush saying it happened on his watch knowing it would hurt the Republican Party in the election setting it up that Barack Obama could use this to his advantage.

    Karl Marx once compared a Revolutionary struggle with the work of the mole, who sometimes burrows so far beneath the ground that he leaves no trace of his movement on the surface.

    Barack Obama is that Marxist mole !

  • Posted By: Nowforsomemoretruth @ 11/02/2008 4:03:45 PM

    Kelo v. City of New London, 545 U.S. 469 (2005),
    What does redistributive mean. Well, remember that it was the liberal Left-Wing Justices of the U.S. Supreme Court that brought us this little jewel, holding that the government could take your real property, like your home, not for public use like a road or school, but to give to another private individual, such as a political contributor or other party hack or interest group.
    Kelo v. City of New London, 545 U.S. 469 (2005), was a case decided by the Supreme Court of the United States involving the use of eminent domain to transfer land from one private owner to another to further economic development. The case arose from the condemnation by New London, Connecticut, of privately owned real property so that it could be used as part of a comprehensive redevelopment plan. The Court held in a 5-4 decision that the general benefits a community enjoyed from economic growth qualified such redevelopment plans as a permissible "public use" under the Takings Clause of the Fifth Amendment. Justice John Paul Stevens wrote the majority opinion; he was joined by Justices Anthony Kennedy, David Souter, Ruth Bader Ginsburg and Stephen Breyer
    The decision was widely criticized by American politicians and the general public. Many members of the general public viewed the outcome as a gross violation of property rights and as a misinterpretation of the Fifth Amendment, the consequence of which would be to benefit large corporations at the expense of individual homeowners and local communities. Some in the legal profession construe the public's outrage as being directed not at the interpretation of legal principles involved in the case, but at the broad moral principles of the general outcome.
    http://en.wikipedia.org/wiki/Kelo_v._City_of_New_London

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