Coolidge died on Jan. 5, 1933, so if he had been re-elected in 1928 he would have died in office. (He died of a coronary thrombosis--perhaps the stress of office would have killed him sooner if he had still been President.)
If Coolidge had run again in 1928 with the same running mate, at his death Charles Curtis would have become President. Curtis was part Indian.
Scratch that last sentence. Charles Curtis was Hoover’s Vice President. The man who would have become President if Coolidge had died in office was Charles Dawes.
Scratch that last sentence. Charles Curtis was Hoover’s Vice President. The man who would have become President if Coolidge had died in office was Charles Dawes.