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WASHINGTON : US President  Barack Obama  attends the Senate  Democratic  caucus meeting with lawmakers on Capitol Hill to talk up the legislative agenda including his ambitious plans to overhaul the health care system .
 Barack Obama, Democratic
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 Barack Obama, Democratic