The original user, upset at his template being used without credit, changed the image, so that it said: "Dear Supporters, Today I announce that I have reversed my position and come out in full support of gay marriage... particularly marriage between passionate females. John"
McCain's MySpace page has subsequently been fixed.
BTW, the Republican candidate for president with the most MySpace friends is libertarian Rep. Ron Paul, who has for some reason been removed from multiple online polls about candidate preferences (including Pajamas Media and Slate's reporting of the online idea futures).
UPDATE (March 30, 2007): Pajamas Media has re-listed Ron Paul and added Fred Thompson this week; Fred Thompson is leading and Ron Paul is in second for the Republicans; Bill Richardson is leading for the Democrats. Not that online, self-selected polling has any reflection on how an actual vote would go...