Drawing John McCain is kinda hard; in other words, he doesn't simplify easiely. He's got a wide jaw, a small mouth, a blunt-yet-pointy nose, and twinkly, I-dare-you eyes. I've drawn him a dozen or so times, and this one's my favorite. It was for US News & World Report back when I did a weekly caricature for them, and it appeared soon after McCain lost the '04 nomination. To chill out (hah!) after the pressures of the campaign, McCain and his wife went to the Antarctic to look into the effects of global warming. Plus evidently McCain's a penguin fan, as who isn't? So my advice for drawing McCain is: if you get a chance, draw him with a mass of penguins. I don't know why, but it seems to work.
