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He became the first sitting vice president to be elected president since Martin Van Buren in 1836 , the first person to succeed a president from his own party via election since Herbert Hoover in 1929 .
 person: Martin Van Buren; person: Herbert Hoover; time: 1929
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Martin Van Buren; person: Herbert Hoover; time: 1929