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He was of vital importance in the presidential elections of 1942 and 1946 , in the first by causing a division of votes of the liberals , supporting Juan Antonio Ríos , and in the second by presenting himself as a preliminary candidate of the liberals .
 Juan Antonio Ríos
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Juan Antonio Ríos