The Democratic robo-polling firm Public Policy Polling is exploring a significant change to its methodology to include the tens of millions of voters who do not have landline telephones.PPP next Tuesday will issue a request for proposals on including respondents who only have cell phones, said Tom Jensen, the firm's director, who oversees PPP's day-to-day operations. These proposals may include live-operator phone calls to cell-phone respondents and text- and Internet-based responses. ...

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