Fox News reports that the Commission on Presidential Debates says it will hold the debate Friday night. Ole Miss still plans on the debate taking place.
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The Depression started in '29. FDR was Governor of New York, and not running for President in '29. He was sworn in as President in '33, and ran for re-election in '37. There was the Recession of '37, and FDR initiated a spending program in the spring of '38. By '40, the government had begun spending on the military, and drafting men into the service.
FDR was reelected in the fall of '40. By June 6, 1941, he was already in office and wouldn't have had to debate anyone. In FDR's case, the Great Depression had already started. In McCain's case, he's trying to fend off another Great Depression from taking place.
Abraham Lincoln. He held no elected office when he ran for President in 1860, and the first real land battle of the Civil War didn't occur until July of 1861. There wouldn't have been any need to postpone any debates or suspend a campaign during the summer of 1860. And I can't find any record of any debates taking place in the election of 1864.
One note of interest: The primary for NY City Mayor, was supposed to have taken place on September 11, 20001, but was postponed until September 25th.