PHILADELPHIA (Reuters) -Pennsylvania's hotly contested U.S. Senate Republican primary between TV personality Dr. Mehmet Oz and former hedge fund executive David McCormick was still undecided on Wednesday, after a technical error delayed the counting of thousands of ballots.

Oz, whose candidacy was propelled by a late endorsement from former President Donald Trump, led McCormick by just over 500 ballots cast on Tuesday out of nearly 1.3 million counted, while conservative political commentator Kathy Barnette trailed at a distant third, according to Edison Research.

Under Pennsylvania law, any margin of 0.5% or less triggers an automatic recount.

A McCormick adviser told Reuters on Wednesday that they estimate there are somewhere between 30,000 to 50,000 votes that remain uncounted, with some 23 counties still tallying votes. "I don't see any scenario, at this point, that a recount is not triggered," the adviser said.

The two leading campaigns focused on Lancaster County, where election workers were processing thousands of ballots after delays caused by a technical error on Tuesday.

The Oz and McCormick campaigns have poll watchers in the county and will be also sending people to monitor the processing of provisional and military ballots across the state, according to campaign officials. Both campaigns say they are preparing for a potential recount.

Both Oz and McCormick told supporters late on Tuesday that they expected to win.

On the Democratic side, Pennsylvania's...

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