The only thing strange about it is the irony that the letter is written and signed by "Dick Morris, Former Clinton Advisor." Morris says that his role in this GOP fundraising effort (fittingly, accompanied by a poll which the letter recipient is urged to answer and return with his/her contribution) is analagous to the Swiftboat veterans in the '04 campaign: having known the Democrat(s) from their inside circle in the past, he can tell you all about the disaster they would cause if they were to win back the White House.
Although I agree with Morris' general conclusion there, I'd put more trust in his sincerity if he would come out state unequivocally that he is a Republican. But until that happens, Morris must regarded as a slick operative who no qualms about selling his services to folks on either side of the political divide. So regardless of what he has to say on any issue, take him for what he is.