The last time we went to HOP was after Bush was elected, but before his figure had been installed. We heard a lot of comments in the waiting area before the show - The people stading near us happened to be Republicans, so we heard a lot of things like"Do you think they'll put W next to his daddy? They should just take out Clinton. He doesn't belong there." During the actual presentation, we heard some boos and some claps for Clinton, as well as some rude comments (the voices sounded very much like the people we had heard in the waiting area).
The boos and comments totally ruined the show for us and we have not been back since. The show itself is not partisan, but some people react to the show in a partisan way (it was only a small percentage in the last show we were in, and from what others have written, it's only in a small percentage of shows). I just don't come to WDW to hear that though.