Create a set of triples that describes the content in the following sentence.

Barack Obama had 55% support against John McCain's 38% in the Jan 4-6 2008 poll conducted by Survey USA in Iowa.
[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