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At a campaign stop in Pennsylvania last week, Mr. Romney predicted he would win Pennsylvania. Despite Mr. Romney’s confidence, his campaign hasn’t been airing ads in the state.

In 2008, Barack Obama won the state by 10 percentage points over Sen. John McCain, Arizona Republican. A Quinnipiac/New York Times/CBS News poll last week showed Mr. Obama ahead there by 12 points.

A survey by The Philadelphia Inquirer earlier this year estimated that nearly 10 percent of state residents, or 1.3 million people, lacked proper photo ID. The percentage was even higher in Philadelphia, where Democrats outnumber Republicans about 6-to-1.