Wal-Mart is one of several large retailers that say an increase in the payroll tax may hurt U.S. sales in the months ahead. Daniel Acker/Bloomberg via Getty Images hide caption

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Transportation Secretary Ray LaHood (left) answers questions during a briefing with White House Press Secretary Jay Carney on Friday. Win McNamee/Getty Images hide caption

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U.S. Treasury checks are run through a printer. William Thomas Cain/Getty Images hide caption

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Kansas Gov. Sam Brownback, shown delivering the State of the State address last month, is pushing to get rid of the state's income tax, which has some Republicans concerned. Charlie Riedel/AP hide caption

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A US Airways plane rests near two American Airlines jets at Ronald Reagan Washington National Airport last year. The combined carrier would be named American Airlines. Jim Watson/AFP/Getty Images hide caption

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Wendy Brown of Schenectady, N.Y., holds a sign before an Occupy Albany rally pushing for a raise in New York's minimum wage on May 29, 2012. Mike Groll/AP hide caption

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Raul Rivero fills up in Miami. Having less take-home pay at the same time gas prices are rising could dampen consumer spending, economists say. Joe Raedle/Getty Images hide caption

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