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The East Coast/West Coast rivalry just took on gubernatorial proportions.

California Gov. Jerry Brown hit back at Chris Christie Friday after the bombastic New Jersey governor called Brown an "old retread" at the Republican National Convention.

Turns out Brown, 74, didn't take too kindly to the insinuation he was too old for office.

"Nothing wrong with being a little retread," Brown said Thursday night in a speech to the United Food and Commercial Workers' union, Local 770. "I'm slowed down a little bit. But I have to tell you, I ran three miles in 29 minutes two nights ago."

Then Brown got personal.

"I hereby challenge Gov. Christie to a three-mile race, a push-up contest and a chin-up contest," he said. "Whatever he wants to bet, I have no doubt of the outcome."

Brown's challenge comes days after Christie told the California GOP delegation he remembered Brown running in a presidential primary against former President Jimmy Carter.

"California made a bad choice by going with an old retread," he said. "I cannot believe you people elected Jerry Brown over Meg Whitman."

Christie spokesman Kevin Roberts hit back at Brown today.

"Defensive much?" he said. "This is what it looks like when you're out of ideas, I guess. Except, of course, raising taxes."

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