Wes Clark pointed out that John McCain's military experience isn't, by itself, an automatic qualifier for President. I've watched Clark both saying it originally and then standing up for what he said, and his point is valid. He rightfully praises McCain's service, his suffering as a POW, and his sacrifices, and I honor McCain for these things as well, but I agree with Clark.
Military service doesn't necessarily qualify a person for President. It gives a helpful understanding of the military that someone who hasn't served won't have, and I'd prefer our President to have military service, but it's not a deal breaker. More relevant is what specific experiences in service does a person have, and how do they relate to holding office.
Anyway, I've read a couple of opinions that Clark is bugged by McCain because Clark was a grunt in Vietnam while McCain was a flyboy. Here's one such opinion. I don't know what's motivating Clark, but I'll tell ya, that feeling does exist. In fact, I've seen the mini-poster below hanging in lots of Army offices and cubicles and it always makes me laugh. (Click to enlarge)