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2008 Iowa Democratic presidential caucuses - Wikipedia
2008 United States presidential election in Iowa - Wikipedia
Database - 2008 Caucus Results - Iowa Watch
2008 Iowa Democratic Caucus - RealClearPolling
Iowa Caucus History: Obama's 2008 Victory
Iowa Caucus Results - Election Guide 2008 - The New York Times
Obama Takes Iowa in a Big Turnout as Clinton Falters; Huckabee …
Obama wins Iowa as candidate for change - CNN.com
2008 Iowa Democratic presidential caucuses - Wikiwand articles
Obama and Huckabee win big in Iowa - POLITICO