How many probable Presidents declined to run?

[tpfkaw]

RFK (in 1964)

Calvin Coolidge (in 1928 and possibly 1932)

Eisenhower (in 1948)

Any Democrats who would've had a better shot at nomination than Woodrow Wilson or Franklin Roosevelt in 1912 or 1932

Any Republican who would've had a better shot at nomination than McKinley in 1896

Any Republican who would've had a better shot at the nomination for Vice-President than Roosevelt in 1900