Although many caucuses had not concluded, news organizations said that surveys of voters taken before their arrival at the caucuses the Iowa equivalent of exit polls, which are conducted after voters cast ballots had provided enough data for their election experts to confidently declare a winner.
For its part, The A.P. said that its race call, which The New York Times relied upon in reporting its own results, was based on an analysis of early returns as well as results of A.P. VoteCast, its proprietary voter survey system that the outlet said showed Trump with an insurmountable lead.
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