[['[TABLECONTEXT]', 'POLL_SOURCE', 'Survey USA'], ['Survey USA', 'DATE', 'Jan 4-6, 2008'], ['Barack Obama', 'DEMOCRAT_%', '55'], ['[TABLECONTEXT]', '[TITLE]', 'Opinion polling by state for the United States presidential election, 2008 (Iowa)'], ['Survey USA', 'DEMOCRAT', 'Barack Obama'], ['John McCain', 'REPUBLICAN_%', '38'], ['Survey USA', 'REPUBLICAN', 'John McCain']]
Barack Obama had 55% support against John McCain's 38% in the Jan 4-6 2008 poll conducted by Survey USA in Iowa.