In both a recent Gallup survey of the American public, and in a recent C-SPAN survey of fifty-eight professional observers of the presidency, President was ranked as the greatest.

Abraham Lincoln

Explanation:

Based on the information provided within the question it can be said that in this survey President Abraham Lincoln was ranked as the greatest. Abraham Lincoln was the 16th president of the United States of America. He was born on February 12, 1809 in Kentucky, United States and is most notably known for leading the American Nation through their greatest moral and political crisis, which was the American Civil War.

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