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The investigators said they have identified “a person of interest” in the birth certificate matter.

Sheriff Arpaio’s chief investigator on the project said there are so many questions that he couldn’t have cleared Mr. Obama to be an employee of Maricopa County.

Pursuing questions about the birth certificate has been a thorny issue for the GOP. State lawmakers in several places, including Arizona, have pursued laws that would have imposed checks on any presidential candidate’s qualifications to get on their state ballots.

One such proposal in Arizona, which became known as the “birther” bill, was vetoed by Gov. Jan Brewer last year.