A supporter of President Barack Obama raises his arms as it is announced that Obama was re-elected during an election night watch party in Chicago. Jerome Delay/AP hide caption

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Allan Lichtman, a professor at American University, discusses his 13 keys to a successful election campaign on April 13 in his office in Washington, D.C. Paul J. Richards/AFP/Getty Images hide caption

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In June, former Massachusetts Gov. Mitt Romney was making the case for the repeal of the administration's health law. With his defeat, the law is looking secure. Charles Dharapak/AP hide caption

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Republican presidential candidate Mitt Romney speaks about the Supreme Court ruling on health care in Washington on June 28. Charles Dharapak/AP hide caption

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Mitt Romney speaks Monday at a campaign event at Avon Lake High School in Avon Lake, Ohio. Tony Dejak/AP hide caption

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During a campaign speech at Veterans Memorial Park in Manchester, N.H., Oct. 18, President Obama once again embraced the term "Obamacare" while discussing the Affordable Care Act. Darren McCollester/Getty Images hide caption

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A print in The Illustrated London News of Dec. 3, 1864, depicts Election Day in a wealthy (top) and poor (bottom) neighborhood in New York. The top caption reads: "A polling-place in the 'upper ten.' " The bottom caption reads: "A polling-place among the 'lower twenty.' " Click Here To See A Full-Size Image Library of Congress hide caption

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Annual "Biketoberfest" participants ride along Beach Street in downtown Daytona Beach, Fla., in 2010. Daytona Beach Visitors Bureau hide caption

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Republican presidential nominee Mitt Romney and President Obama spar over energy policy during the second presidential debate at Hofstra University on Tuesday. Charlie Neibergall/AP hide caption

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CNN's Candy Crowley moderates the second presidential debate between Mitt Romney and President Obama at Hofstra University in Hempstead, N.Y., on Tuesday. Saul Loeb/AFP/Getty Images hide caption

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Vice President Biden (left) and Republican vice presidential candidate Paul Ryan during Thursday's debate. Saul Loeb/AFP/Getty Images hide caption

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Professor John Straayer has taught political science at Colorado State University in Fort Collins for 46 years. He is not surprised that this year's race in Colorado is among the tightest in the nation. Becky Lettenberger/NPR hide caption

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Republican presidential nominee Mitt Romney meets audience members after he addressed the U.S. Hispanic Chamber of Commerce in Los Angeles on Monday. Charles Dharapak/AP hide caption

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