Tulip Courtesy of Benjamin Swett hide caption

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American farms like this iceberg lettuce field owned by Duda Farm Fresh Foods outside Salinas, Calif., are facing a dwindling supply of farmworkers from rural Mexico. Kirk Siegler hide caption

toggle caption Kirk Siegler

President Obama during his news conference Tuesday at the White House. Larry Downing /Reuters /Landov hide caption

toggle caption Larry Downing /Reuters /Landov

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