Nine. Five of them were not elected to a term in their own right - Tyler, Fillmore, Andrew Johnson, and Ford. the other four were elected to their own term after finishing the term of their deceased...
16 of the first 43 people who served as U. S. President had been a U. S. Senator: James Monroe (Virginia) John Quincy Adams (Massachusetts) Andrew Jackson (Tennessee) Martin Van Buren (New York)...