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He sought the Democratic nomination in the 2010 U.S. Senate election in Iowa but came in third against Roxanne Conlin who won the primary , with Bob Krause coming in second .
 Democratic, Iowa, Roxanne Conlin, Bob Krause
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Democratic, Iowa, Roxanne Conlin, Bob Krause