<prompt> Translate the following text to EnglishUtafiti huo ulifanyika mwaka 1948 na ulionyesha kwamba Thomas E. Dewey, aliyekuwa mwanasiasa wa Republican, angemshinda Harry S. Truman, aliyekuwa mwanasiasa wa Democrat.  <response>: This technique was in widespread use until 1948, when the major national polls based on this technique all predicted that Republican Thomas E. Dewey would defeat incumbent Democrat Harry S. Truman. 