Forum gets tense in GOP's sharp-elbowed US Senate primary

David McCormick (L) and Mehmet Oz (R) are among the candidates vying to replace Senator Pat Toomey.

The first public appearance between the highest-profile Republicans running for U.S. Senate in Pennsylvania quickly became chippy Wednesday, as themes playing out in millions of dollars in sharp-elbowed TV attack ads played out on a small forum stage.

The campaign in one of this year's premier Senate contests also has been roiled by the arrival of three wealthy and well-connected candidates from other states, injecting carpetbaggery into the race as a prominent and persistent issue.

Mehmet Oz — the celebrity heart surgeon best known as daytime TV’s host of "the Dr. Oz Show" — absorbed the brunt of criticism from rivals seated beside him.

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In any case, Oz said, he didn't mind being attacked and had thick skin.

"Why is everyone attacking me?" Oz asked the audience rhetorically at the Manufacturer & Business Association offices in Erie as he began his closing speech.

"Because you're a liberal," interjected Kathy Barnette, a one-time congressional candidate. That drew a protest from Oz, an admonishment from the moderator and Barnette's refusal to agree to be quiet.

Energy was a constant theme, since Pennsylvania is the nation's No. 2 natural gas-producing state, and former hedge fund CEO David McCormick turned a question about energy policy into an attack, accusing Oz of repeatedly raising questions about "fracking" in the past.

Oz shot back that McCormick was wrong and lying.

Until Wednesday, Oz and McCormick had largely skipped forums attended by other candidates and not crossed paths in public.

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