OK...Here's my two cents on this...
In my opinion, labelling Brokeback Mountain 'politically correct' is simply a poor attempt by someone who feels threatened to diminish or marginalize the messages of this wonderful film.
At one level, it is most certainly a personal and intimate story about two poor shepherds and the love they discovered together. Just call it the 'gay cowboy movie' if you'd like. But it is much, much more than that, or we wouldn't be here talking about it.
The 'threat' comes from the underlying messages, from seeing Jack and Ennis, not as gay cowboys, but as people you might know and have come to care for, from seeing some of ourselves in Jack and Ennis, and asking the bigger questions.
I feel like I'm on a soapbox here, so I'm going to stop.
Respectfully,
Lynne