NEW : A pro-Santorum PAC buys $ 310,000 in ad time in Illinois . Santorum says that English should be required for Puerto Rico to become a state . Score: 6 Puerto Rico , next on the campaign trail , has a statehood referendum in November .
NEW : A pro-Santorum PAC buys $ 310,000 in ad time in Illinois . Santorum says that English should be required for Puerto Rico to become a state . Romney 's campaign responds with a statement saying he would not require that . Puerto Rico , next on the campaign trail , has a statehood referendum in November .