A statistical expert is defending his estimate that hundreds of thousands of Pennsylvania voters lack the photo identification they need to vote under a state law whose constitutionality is on trial.
Bernard Siskin, a Philadelphia consultant hired by the plaintiffs in the case, described his research in detail Tuesday as the trial's first witness.
Siskin found that more than a half-million voters either lacked one of the three forms of photo IDs issued by the Pennsylvania Department of Transportation or possess IDs that expire before the Nov. 5 election.
A state consultant criticized Siskin's report in court papers, saying it exaggerates the problem, and Siskin said the consultant's methodology is faulty.
The plaintiffs hope to overturn the law backed by the Legislature's Republican majority and GOP Gov. Tom Corbett.