New York Senator Thomas Dewy was running for president against Franklin Roosevelt and sought to attract Jewish voters by supporting the establishment of a Jewish state in Palestine. The Republican platform adopted at the national convention subsequently called for the implementation of the Balfour Declaration and condemned Roosevelt for failing to pressure the British to fulfill their promise. The Democrats subsequently adopted a pro-statehood position at their convention. The appeal to Jewish voters did not resonate for Dewey, who lost their vote by a margin of 90%-10%. This is the relevant excerpt from the Republican platform:
Republican Party Platform of 1944, The American Presidency Project.