"In the al-Qaeda manual on terror, they were telling people to go out and buy assault weapons, to come to America and buy assault weapons," Kerry said at a rally in Missouri. "Every law enforcement officer in America doesn't want us selling assault weapons in the streets of America. But George Bush, he says, 'Well, I'm for that.' "

Bush's campaign dismissed Kerry as an opportunist. "To infer that the president is helping terrorists is a clear example of a desperate candidate," campaign spokeswoman Tracey Schmitt said.

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The 1994-2004 ban expired, and in 2008 and 2012, there was no similar campaign by Democrats to promote an assault weapons ban. But in interviews since the Orlando shootings, Hillary Clinton has called for the ban to return, and linked the easy availability of semiautomatic weapons to terrorism.

"We’ve got to keep weapons of war off our streets, as well as blocking suspected terrorists from buying guns," the presumed Democratic presidential nominee said Monday on "CBS This Morning."

It was not a new position for Clinton. She had voted with Kerry to extend the old assault weapons ban; last year, she called for a new ban. Her 2015 proposal was read as evidence that she was more interested in capturing the center-left Obama coalition than in appealing to conservative Democrats. A Washington Post-ABC News poll that had tracked voter opinion of the ban had support above 70 percent when Congress let it expire, but just 45 percent in 2015.

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Increasingly, Democrats wonder whether the threat of terrorism will change that. "The fears have certainly been borne out," said Bob Shrum, Kerry's 2004 campaign strategist. "The issues are more salient today than they were then, because the focus then was on dangers overseas. You had President Bush saying, 'We're fighting them over there so we don't have to fight them here.' You don't hear that anymore."

Kerry, Shrum said, did not start talking about assault weapons because it polled well. "We had no expectation that it was politically powerful," he said. "It’s more powerful now because we have a combination of domestic terrorism and an ability to go into any gun show and buy an AR-15."