"Note my qualification: beyond a certain level. That level is widely regarded as about LTC."
The OP was referring to a LTC. Your original comment was that this LTC was a prime example of how kissing ass gets a person promoted. LTC selection rate in the Army was over 90% last year. That doesn't sound political. That sounds like anyone with a pulse, which isn't any better in my opinion.
The truth of the matter is that people aren't promoted by the people they work for. A board, completely unfamiliar with the officer, chooses who is promotable. Yes, the officer's evaluations by his rater or considered, but fluff is easy to see through.
My experience with this is that the ones who complain the most about how political promotions are within military are often poor performers themselves. I've yet to meet a supremely squared away Soldier that didn't get promoted for no discernible reason.