Denver - Sen. Barack Obama's campaign and its allies, mindful of the lessons of the Swift boat attacks of 2004, have begun an aggressive, multi-pronged attack on an advertisement running in swing states that seeks to link the Democratic presidential candidate to former domestic terrorist William Ayers.

    With threats of legal action, boycotts and a response ad launched quietly to avoid publicity, the Obama campaign has put conservative donors and television stations on notice that 2008 will not be 2004, when Sen. John F.

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