Barack Obama

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President Barack Obama, surrounded by members of Congress, looks up while signing the farm bill, Feb. 7, 2014, at Michigan State University in East Lansing, Mich. From left are, Sen. Carl Levin, D-Mich., Senate Agriculture Committee member Sen. Patrick Leahy, D-Vt. Senate Agriculture Committee Chair Sen. Debbie Stabenow, D-Mich., Senate Agriculture Committee member Sen. Amy Klobuchar, D-Minn., Agriculture Secretary Tom Vilsack, Rep. Marcia Fudge, D-Ohio and Rep. Gary Peters, D-Mich. (AP Photo/Jacquelyn Martin)

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President Barack Obama, and Senate Agriculture Committee Chair Sen. Debbie Stabenow, D-Mich. wave from Air Force One upon their arrival at Capital City Airport in Lansing, Mich., Friday, Feb. 7, 2014. (AP Photo/Duane Burleson)

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President Barack Obama boards Air Force One at Andrews Air Force Base, Md., Friday, Feb. 7, 2014, prior to departure to Michigan where he is expected to speak about the farm bill. (AP Photo/Jacquelyn Martin)

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FILE - In this Jan. 31, 2014 file photo, President Barack Obama speaks in the East Room of the White House in Washington. As Republican leaders dampen hopes for overhauling immigration laws this year, the White House for now is betting that the display of GOP resistance is temporary and tactical and is resisting pressure from some allies to have President Barack Obama take matters into his own hands. (AP Photo/Carolyn Kaster, File)

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David Bransfield, a state outreach coordinator for Young Invincibles, a group which supports President Barack Obama's health care law, works on his computer at a table set up to sign people up for health care at the University of the District of Columbia in Washington, Thursday, Jan. 30, 2014. An army of workers and volunteers has fanned out around the country trying to enroll young and healthy people in health insurance now available through Obama’s signature law. (AP Photo/Charles Dharapak)

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David Bransfield, a state outreach coordinator for Young Invincibles, a group which supports President Barack Obama's health care law, talks with student Philippe Komongnan, 27, who is in the process of signing up for health care, at the University of the District of Columbia in Washington, Thursday, Jan. 30, 2014. An army of workers and volunteers has fanned out around the country trying to enroll young and healthy people in health insurance now available through Obama’s signature law. (AP Photo/Charles Dharapak)

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David Bransfield, a state outreach coordinator for Young Invincibles, a group which supports President Barack Obama's health care law, right, is seated with Dr. Christopher Riley, left, of Assist DC, as they look to sign up students for health care at the University of the District of Columbia in Washington, Thursday, Jan. 30, 2014. An army of workers and volunteers has fanned out around the country trying to enroll young and healthy people in health insurance now available through Obama’s signature law. (AP Photo/Charles Dharapak)

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In this Jan. 29, 2014 photo, the sun sets behind a shelter at the Vivian Gordon Harsh Park in Chicago where 15-year-old Hadiya Pendleton was shot and killed one year ago during a gang dispute she had nothing to do with about a mile from President Barack Obama’s Chicago home. Since her death one year ago, the number of homicides and other violent crimes that turned Chicago into a national symbol of gun violence have fallen sharply. Nobody believes the problem has been solved. Yet Hadiya great uncle, Nathaniel Pendleton, said he feels more hopeful. (AP Photo/Charles Rex Arbogast)