Title: Is the PEW Research Center biased? - Quora
Headings: Is the PEW Research Center biased?
Is the PEW Research Center biased?
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What is the significance of the Pew Research Center's worldwide survey of Muslims concerning their views about Sharia Law?

Content: Whil
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The short answer: Gallup is a for profit business, Pew is supported by a private philanthropy. But there’s a lot more to the story. In the early to middle 1930s George Gallup (1901–1984) was one of three men, along with Elmo Roper (1900-1971) and Archibald Crossley (1896-1985) who, working independently, simultaneously created the methods employed in public opinion survey research. They did this as for profit businesses, and they established organizations that became the training ground and model for generations of researchers who came after them. All three of their stories are interesting. While they all had stunning success in the ‘30s, they all incorrectly predicticted the election in 1948 and they all worked to improve their methods and set some standards and best practices. Gallup’s story is he started a company in Princeton, New Jersey in 1935 which he called “American Institute of Public Opinion”. Notably, he was the first pollster to stratify his sample to model the demographics of each state's voters. Presumably to correct any distortion caused by the Electoral College.