Volunteers in Des Moines make calls at the campaign headquarters of then-Democratic presidential hopeful Sen. Barack Obama on Dec. 5, 2007 ahead of the Iowa caucus. Obama has called those "fired-up" campaign workers from his 2008 campaign, one of his proudest legacies. Rick Gershon/Getty Images hide caption

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Rick Gershon/Getty Images

Obama's Legacy: His Army Of Campaign Volunteers Continues To Serve

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Trump campaign manager Kellyanne Conway sits with Robby Mook, Hillary Clinton's campaign manager, before a forum at Harvard University's Kennedy School of Government. Charles Krupa/AP hide caption

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Charles Krupa/AP

There's a difference...

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Arizona Cardinals fans wear masks of Presidential candidates Donald Trump and Hillary Clinton during the NFL game between the New York Jets and Arizona Cardinals Oct. 17, 2016. Norm Hall/Getty Images hide caption

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Norm Hall/Getty Images

Stop Lying, America. You Love Election 2016

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Donald Trump delivers a speech as he officially opens his Trump Turnberry hotel and golf resort in Scotland on Friday. Donald Trump hailed Britain's vote to leave the EU as "fantastic" shortly after arriving in Scotland. Oli Scarff/AFP/Getty Images hide caption

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Oli Scarff/AFP/Getty Images

Shiman Shan (left) and Brenda Nguyen canvassed voters for the Bernie Sanders campaign in a New York City neighborhood with a growing Chinese-American community. Hansi Lo Wang/NPR hide caption

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Hansi Lo Wang/NPR

In Close Race, 'Unprecedented' Push For Asian-American Voters Comes To N.Y.

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Harry Rubenstein talks about memorabilia from different presidential campaigns. Brandon Chew/NPR hide caption

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Brandon Chew/NPR

From Axes To Flip-Flops: A Peek At 200 Years Worth Of American Political Swag

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Politician Takes To Tinder To Ignite Voters' Interest

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Get ready for your email inbox to be inundated this election season. Ariel Zambelich/NPR hide caption

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Ariel Zambelich/NPR

'Bill Wants To Meet You': Why Political Fundraising Emails Work

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Wisconsin Gov. Scott Walker speaks at a news conference Monday in Madison, Wis., where he announced that he is suspending his Republican presidential campaign. Morry Gash/AP hide caption

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In 1999, then-Rep. John Kasich rode a dog sled after participating in the World Championship Sled Dog Derby award ceremony in Laconia, N.H. When he ran an "exploratory" campaign back then, few people knew who he was. Joel Page/AP hide caption

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Joel Page/AP