Campaign workers and other political operatives are trying to find ways to use Google Glass on the campaign trail. Frederic J. Brown /AFP/Getty Images hide caption

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At CPAC this year, even Sen. Rand Paul's cardboard cutout was drawing attention. The Kentucky lawmaker was leading in the straw poll among attendees Friday. Jim Lo Scalzo/EPA/Landov hide caption

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American Federation of Labor and Congress of Industrial Organizations President Richard Trumka addresses members during the quadrennial AFL-CIO convention at Los Angeles Convention Center in Sept. 2013. Nick Ut/AP hide caption

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New Jersey Gov. Chris Christie speaks to the Economic Club of Chicago on Tuesday. Christie was in town to raise money for the Republican Governors Association. PAUL BEATY/AP hide caption

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Presidents past and present were on hand for the opening ceremony for the George W. Bush Presidential Center in Dallas in April 2013. Kevork Djansezian/AP hide caption

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Republican National Committee chairman Reince Priebus is seen at the Jan. 24 RNC winter meeting in Washington. Priebus celebrates the achievements of black Republicans in a series of new radio ads designed to honor Black History Month. Susan Walsh/AP hide caption

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Mike Huckabee, left, sits with RNC Chairman Reince Priebus before Huckabee spoke at the Republican National Committee winter meeting in Washington on Thursday, Susan Walsh/AP hide caption

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Republican Ed Gillespie announced Thursday that he's challenging Democratic Virginia Sen. Mark Warner in November's election. Gillespie, a senior adviser to Republican Mitt Romney in the 2012 presidential race, is shown here at Romney's election night rally in Boston on Nov. 6, 2012. Mike Segar/Reuters/Landov hide caption

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Trish Gallagher holds a sign for passing motorists to read during a demonstration in support of a higher minimum wage near a Burger King in Boston on Dec. 5. Massachusetts is one of several states considering a minimum wage ballot measure. BRIAN SNYDER/Reuters/Landov hide caption

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Republican Sen. Marco Rubio of Florida delivers a speech on reforming antipoverty programs on the 50th Anniversary of President Johnson's declaration of the "War on Poverty." Kevin Dietsch/UPI/Landov hide caption

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Sen. Rand Paul (R-Ky.) greets supporters during a tea party rally in front of the U.S. Capitol in June. Paul was a rising star in the tea party movement this year, filibustering a CIA nomination in March. Mark Wilson/Getty Images hide caption

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An auto worker tightens bolts on a Focus at a Ford plant in Michigan in October. Labor unions predicted in 1993 that NAFTA would send many U.S. manufacturing jobs to Mexico, and they continue to argue that the pact prompted a race to the bottom for workers. Mira Oberman/AFP/Getty Images hide caption

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