Yeah, I read a similar quote a long time ago, and have never been able to find it again.I am probably horribly mangling the quote, and I don't know who first said it, but a desire for power should automatically disqualify the person seeking it.
I am pretty sure it came from one of the old Greek philosophers.
The way I remember, it went something like this...
Those best suited to govern are those that don't want to.