Barack Obama's starting to talk about his fall campaign as a matter of when, not if - and so are some of his potential general election opponents.

Obama may be running neck-and-neck with New York Sen. Hillary Clinton in most polls of New Hampshire's Democratic voters, but "I know once I win this Democratic nomination that the folks on the other side will come after me with everything they've got," he told an Exeter, New Hampshire crowd Saturday. "They will try to Swiftboat me," he said.

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