Matthew Winthrop Barzun is an American businessman, diplomat and political fundraiser who served as the United States Ambassador to the United Kingdom. He is a business executive who is known for his work with CNET Networks and for his fundraising work on Barack Obama's 2008 presidential campaign. He served as United States Ambassador to Sweden from 2009 to 2011. He was selected by President Barack Obama as National Finance Chair for the president's 2012 re-election campaign. He is author of The Power of Giving Away Power from Optimism Press, an imprint of Penguin Random House.

On April 4, 2011, Barack Obama, the 44th president of the United States, announced his candidacy for re-election as president. On September 5, 2012, he again became the nominee of the Democratic Party for the 2012 presidential election. Along with his running mate, Vice President Joe Biden, Obama was opposed in the general election by former Massachusetts Governor Mitt Romney, along with various minor candidates from other parties. The election took place on Tuesday, November 6, 2012.