The story

As Barack Obama targeted John McCain in his attacks Monday, Hillary Clinton told her supporters the race for the Democratic nomination is "nowhere near over."

Obama and McCain blasted each other's views on foreign policy, with McCain slamming Obama's statement that Iran poses a less serious threat to the United States than the Soviet Union did.

Obama shot back during a speech in Billings, Montana, and asked why the presumptive Republican presidential nominee was afraid to talk to Iran.

Obama said it was the "Bush-McCain" war policy in Iraq, not diplomacy, that would make Iran stronger.

"Make no mistake, Iran is the single biggest beneficiary of a war in Iraq that should have never been authorized and should have never been waged," the front-runner for the Democratic presidential nomination said. Watch Obama respond to McCain Read full article »

CNN's Alexander Marquardt, Alex Mooney and Martina Stewart contributed to this report.

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