"U.S. President Barack Obama speaks at a campaign fundraiser at the Oregon Convention Center", Mustique, sheet of 4 stamps, The President Obama International Stamp Collection.
U.S. President Barack Obama, Portland, OR. No date. Rodney Lawrence Hurst, Sr. Papers. University of North Florida. Thomas G. Carpenter Library. Special Collections and Archives. UNF Digital Commons. https://digitalcommons.unf.edu/hurst_stamps/111/
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