RNC Chairman Mike Duncan sent a letter to Howard Dean regarding The DNC's current negative ad against McCain. The letter was in response to the DNC ad that continues to misrepresent John McCain's 100 year war statement.
This is the Video in question:

Here is the letter:

Republican
National
Committee
April 29, 2008
Chairman Howard Dean
Democratic National Committee
430 S. Capitol St., S.E.
Washington, D.C. 20003
Re: DNC’s Use of “Fahrenheit 9/11” Footage in “100” Ad
Dear Chairman Dean:
I write regarding the Democratic National Committee’s (DNC) advertisement attacking Senator John McCain titled “100,” which was released on Sunday, April 27, 2008.

As you are already aware, and as has been widely reported, the DNC’s ad is troubling for at least two reasons. First, its message is factually false; the DNC is deliberately misleading American voters. Second, it constitutes an illegal excessive in-kind contribution from the DNC to its presidential candidates. Now the Republican National Committee has learned that the ad features footage from Michael Moore’s 2004 conspiracy theory, “Fahrenheit 9/11.”  read more »