Mike Pence

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FILE - In this Feb. 26, 2014 file photo Indiana Republican Gov. Mike Pence embraces a preschool student at the Shepherd Community Center in Indianapolis. Pence's office says he signed a bill said Monday, March 24, 2014 pulling Indiana from reading and math standards that were adopted by most states around the country. (AP Photo/Tom LoBianco, File)

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Gov. Mike Pence embraces a preschool student at the Shepherd Community Center Wednesday, Feb. 26, 2014, in Indianapolis. Pence has had trouble winning support from lawmakers for his proposed preschool voucher program. (AP Photo/Tom LoBianco)

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President Barack Obama, right, and Gov. Mike Pence, R-Ind., toast during a dinner for the National Governors Association in the State Dining room of the White House on Sunday, Feb. 23, 2014, in Washington. (AP Photo/ Evan Vucci)

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** FILE ** Gov. Mike Pence, Indiana Republican, said states need to have the "freedom and flexibility to craft policies" on CNN's "State of the Union." (Associated Press)

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Indiana Gov. Mike Pence talks with Lt. Gov. Sue Ellspermann before giving his State of the State address to a joint session of the Legislature at the Statehouse Tuesday, Jan. 14, 2014, in Indianapolis. (AP Photo/Darron Cummings)

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Indiana Gov. Mike Pence walks to the podium to give his State of the State address to a joint session of the Legislature at the Statehouse Tuesday, Jan. 14, 2014, in Indianapolis. (AP Photo/Darron Cummings)

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Indiana Gov. Mike Pence delivers his State of the State address to a joint session of the Legislature at the Statehouse Tuesday, Jan. 14, 2014, in Indianapolis. (AP Photo/Darron Cummings)

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Indiana Gov. Mike Pence delivers his State of the State address to a joint session of the Legislature at the Statehouse Tuesday, Jan. 14, 2014, in Indianapolis. (AP Photo/Darron Cummings)

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Indiana Gov. Mike Pence delivers his State of the State address to a joint session of the Legislature at the Statehouse Tuesday, Jan. 14, 2014, in Indianapolis. (AP Photo/Darron Cummings)