Furthermore, Weinberg had argued that it is probable that Roosevelt, who knew of the "enormous gratuity" MacArthur had accepted from Quezon in 1942, had used his knowledge of this transaction to blackmail MacArthur into not running for president. Finally, despite the best efforts of the conservative Republicans to put MacArthur's name on the ballot, on 4 April 1944, Governor Dewey won such a convincing victory in the Wisconsin primary (regarded as a significant victory given that the Midwest was a stronghold of the conservative Republicans opposed to Dewey) as to ensure that he would win the Republican nomination to be the GOP's candidate for president in 1944.