E.J. Dionne offers some advice:

McCain has shown he wants the presidency so badly that he's willing to say anything, true or false, to win power. Obama can win by fighting for what he believes. What he can't do is wait for the media to call McCain out--although they should--or expect voters to know he'll fight for them when they are not yet sure that he's willing to stand up for himself.

Yes, but always, always on the issues. No personal attacks. Leave those and the outright lies to the liar, McCain.

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