An exchange of charges this morning between John McCain and a senior adviser to Barack Obama marks the first time the two frontrunner campaigns have conversed about foreign policy. Welcome to the new normal: presidential politics without Hillary Clinton.

McCain began last last night, implying that Obama's policies amounted to "no more than a holiday from history and a return to the false promises and failed philosophy that trusts in government more than the people." This morning, he called Obama "naive" for saying he'd bomb "our ally in Pakistan."

The Obama campaign offered Susan Rice, a senior adviser to Obama on foreign affairs and a leading Clinton administration fopo official, to rebut. "Barack Obama had the vision to see that The Bush-McCain approach of putting all of our eggs in Musharraf’s basket was flawed," she said. And McCain's "approach to foreign policy is very much a continuation of the flawed Bush policy. He really is in many respects just four more years of George Bush."

More: Yglesias breaks it down.

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