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I don't think these kinds of attacks really sway anyone, they just reinforce preconceived notions amongst a group of people who were dead set against the candidate to start.
I don't think the swift boaters hurt Kerry as much as his record and general lack of charisma.
In general these issues become usefull strawmen to blame defeat on, but I think their actual effect on voters is negligable.
That being said however, it's all the Republicans seem to have, and reacting to it, loudly a vocally debunking it, even showing fear on the topic may be part of Obama's plan.
Think about it, if these issues don't really effect the electorate, then what better way to fool your oponant then to make them think you are really worried about these attacks. By loudly debunking the attacks, and by some theories giving credence to the attacks, you encourage more of the same (as opposed to an ad focused on real issues that might sway the electorage).
So I'm thinking it's a classic rope a dope, let the opponant think they are hurting you, let them blow their funds and energy on an unsuccessful mode of attack, and then come on strong in the solid pocket book and security issues that do sway the public.
The Crypt Keeper is already on the ropes and doesn't letting him swing wildly, infact encouraging him to swing wildly will likely just exhaust the old man and his limited funds, while the far more capable politician steps up, knocks him out, and win November in a Landslide.
Sounds good to me.