In reference to John McCains integrity,Howard Dean says, "He doesn't have any"".

Update From Mcain Cmpaign:Updated 6:11 p.m. with response from the McCain campaign: "John McCain is a man of integrity who will run on his record. Senators Clinton and Obama should denounce this desperate, personal smear campaign Howard Dean and the leaders of their party seem intent on running," the McCain campaign said in a statement to CNN.
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Here is a letter sent to the FEC on Febuary 28th on behalf of John McCain. Notice the reference to Howard Dean using much the same "procedures" to opt out of public financing.

Here is Box D of the FEC form that the McCain Campaign submitted:

Notice the disclaimer .."Excluding certifications for Federal Matching Funds"