(CNN) – John Kerry says he remembers what it is like to be "swift boated." Eight years later, he sees it happening again.
The senator from Massachusetts brought the group that attacked his military service record in the 2004 presidential campaign into the 2012 conversation in a fundraising e-mail to supporters of President Barack Obama.
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The “swift boated” term refers an advertizing campaign run by Swift Boat Veterans for Truth - a group created under the same portion of the federal tax code as is behind super PACs - which questioned the senator's record of military service.
The group was not affiliated with Kerry's opponent, President George W. Bush, who went on to win reelection.
"But guess what: Bob Perry, the deep-pocketed funder of the "Swift Boat Veterans for Truth," just gave $3 million to Mitt Romney's Super PAC," Kerry said in the e-mail. "Let's be ready for it - let's fight back."
Super PACs have spent millions of dollars in the heated GOP primary, and are expected to continue spending in the general election.
"I know all too clearly that these guys will do or say anything to win. They'll stop at nothing. But forewarned is forearmed," Kerry wrote.
"Their multi-million dollar smear tactics were new in 2004; in 2012 we know their playbook, and shame on us if we don't tear it into shreds. Join me and we will stop the 'swiftboating' of President Obama."