E-mail from a reader who was there:

I was at the McCain event at GCT and I think you might be giving the Hillary supporters a little too much credit. Most of them were in the back the whole time, and “tempers flared” was more like “a temper flared.” If they made any noise, it was inaudible up front, and they were having trouble supporting that one large banner. I looked back a few times and the top of it was barely visible over the heads of the crowd.
Admittedly, the “John McCain for President” chant was tough to sustain (too complicated; president becomes prezzdent when chanted), but some of the rounds of “Mac is back!” were fairly spirited.
Another interesting note was all the random media there. I was interviewed by TV crews from Houston and Taiwan, and the guy next to me spoke to reporters from Brazil and Toronto.
The Taiwanese reporter asked me some ever-so-slightly leading questions, beginning with: “What do you think of [McCain’s] integrity?” So, you know, things are looking good for him in Taiwan.

I saw “tempers,” plural. Don’t forget the McCain supporter who shouted, “Go lose to Obama!”