Just today George W. Bush dropped the banana he was eating, climbed down from the trees in the Rose Garden and endorsed McCain as well ("Ook, ook, eek. John McCain.") The president then gamely checked the senator for ticks.
In the midst of that you've probably missed some other important endorsements that McCain had wrangled out of people just as famous and just as well thought of as the preacher and the Chief Executive.
Khan Noonien Singh - "I'm happy to support John McCain for the White House because he's got a plan for ending illegal immigration and because he's most likely to start the Genetics Wars bringing about the fall of non-bio engineered humans."
Sanjaya- "John McCain has just the lovely singing voice the president should have."
Mr. Blonde - "I love John's stance on torture."
As you can see the list of McCain supporters is quite impressive.