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US elections 2012 : Mitt Romney narrowly beats Rick Santorum in Iowa : Mitt Romney narrowly beats Ric ... http://t.co/Tqyn4CKM # photography
 US, Mitt Romney, Rick Santorum, Iowa, Mitt Romney, Ric
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 US, Mitt Romney, Rick Santorum, Iowa, Mitt Romney, Ric