Supporters of genetically modified food labeling rally last month at Los Angeles City Hall. cheeseslave/ hide caption

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Women use wordplay to protest Republican presidential candidate Mitt Romney's position on women's health care outside the Hyatt Regency, where Romney was scheduled to attend a fundraiser, on March 22 in Washington, D.C. Mark Wilson/Getty Images hide caption

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Republican U.S. Rep. Joe Walsh and challenger Democrat Tammy Duckworth before a televised debate at the WTTW studios on Oct. 18, 2012, in Chicago. Charles Rex Arbogast/AP 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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President Barack Obama and Republican presidential candidate Mitt Romney at the first 2012 presidential debate in Denver, CO. 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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