At this point, no matter who Duncan Hunter endorsed, a large contingent of Freepers would be going WTF????? Rudy, Mitt, Huckabee, Paul, McCain, Keyes, whoever... it would be a large amount of griping from people who didn't receive Duncan's blessing for their personal choice of candidate.
As far as I'm concerned, I'm voting Alan Keyes regardless of Duncan Hunter's recommendation. I am free to disagree, just as Tancredo supporters were free to disagree with Tancredo's endorsement. Such is life.
I'd be curious to know how that is any different than not voting for a presidential candidate at all.