A little history on Polls...
...Hadley Cantril, a member of the faculty of Princeton University Department of Psychology, had used a grant from the Rockefeller Foundation to establish the Office of Public Opinion Research. A supporter of President Franklin D. Roosevelt and intervention in the Second World War he was also an agent for the British Security Coordination and did work for the anti-isolationist group, Fight for Freedom. Cantril was of the opinion that Roosevelt needed "an improving body of public opinion to sustain him in each measure of assistance to Britain and the USSR." Cantril was also an advisor to George H. Gallup and worked closely with David Ogilvy, who was employed by Gallup and was also an agent for BSC.
Another BSC agent, Sanford Griffith, established a company Market Analysts Incorporated and was initially commissioned to carry out polls for the anti-isolationist Committee to Defend America by Aiding the Allies. Griffith's assistant, Francis Adams Henson, a long time activist against the Nazi Germany government, later recalled: "My job was to use the results of our polls, taken among their constituents, to convince on-the-fence Congressmen and Senators that they should favor more aid to Britain."
As Richard W. Steele has pointed out: "public opinion polls had become a political weapon that could be used to inform the views of the doubtful, weaken the commitment of opponents, and strengthen the conviction of supporters." William Stephenson later admitted: "Great care was taken beforehand to make certain the poll results would turn out as desired. The questions were to steer opinion toward the support of Britain and the war... Public Opinion was manipulated through what seemed an objective poll."
Michael Wheeler, the author of Lies, Damn Lies, and Statistics: The Manipulation of Public Opinion in America (2007) has pointed out how this could have been done: "Proving that a given poll is rigged is difficult because there are so many subtle ways to fake data... a clever pollster can just as easily favor one candidate or the other by making less conspicuous adjustments, such as allocating the undecided voters as suits his needs, throwing out certain interviews on the grounds that they were non-voters, or manipulating the sequence and context within which the questions are asked... Polls can even be rigged without the pollster knowing it.... Most major polling organizations keep their sampling lists under lock and key."
The main target of these polls concerned the political views of leading politicians opposed to Lend-Lease. This included Hamilton Fish. In February 1941, a poll of Fish's constituents said that 70 percent of them favored the passage of Lend-Lease. James H. Causey, president of the Foundation for the Advancement of Social Sciences, was highly suspicious of this poll and called for a congressional investigation.
It has been argued that both Arthur Vandenberg and Thomas Connally were targeted by British Security Coordination in order to persuade the Senate to pass the Lend-Lease proposal. Mary S. Lovell, the author of Cast No Shadow (1992) believes that the spy, Elizabeth Thorpe Pack (codename "Cynthia") who was working for the BSC, played an important role in this: "Cynthia's second mission for British Security Coordination was to try and convert the opinions of senators Connally and Vandenberg into, if not support, a less heated opposition to the Lend Lease bill which literally meant the difference between survival and defeat for the British. Other agents of both sexes were given similar missions with other politicians... with Vandenberg she was successful; with Senator Connally, chairman of the Senate Committee on Foreign Relations, she was not."
During the Lend-Lease debate Vandenberg announced on the floor of the Senate that he had finally decided to support the loan. He warned his colleagues: "If we do not lead some other great and powerful nation will capitalize our failure and we shall pay the price of our default." Richard N. Gardner, the author of Sterling Dollar Diplomacy in Current Perspective (1980), has argued that Vandenberg's speech was the "turning point in the Senate Debate" with sixteen other Republicans voting in favour of the bill.
On 11th March 1941, Congress passed the Lend-Lease Act. The legislation gave President Franklin D. Roosevelt the powers to sell, transfer, exchange, lend equipment to any country to help it defend itself against the Axis powers. A sum of $50 billion was appropriated by Congress for Lend-Lease. The money went to 38 different countries with Britain receiving over $31 billion.
When David Ogilvy read an early draft of The Quiet Canadian (1962) he requested that William Stephenson put pressure on H. Montgomery Hyde to remove all references to Hadley Cantril and George H. Gallup: "I beg you to remove all references to Hadley Cantril and Dr. Gallup... Dr. Gallup was and still is, a great friend of England. What you have written would cause him anguish - and damage. One does not want to damage one's friends... In subsequently years Hadley Cantril has done a vast amount of secret polling for the United States Government. What you have written would compromise him - and SIS (MI6) does not make a practice of compromising its friends."
http://educationforum.ipbhost.com/index.php?showtopic=19331Hat tip to DUer Marzupialis and EFer John Simkin.