OK, we all see Dennis Hastert is overweight. Yes, media imagery sets up overweight as ugly, disgusting, an indication of personal weakness, etc. But that's not a fair image, and we shouldn't go along with it. Most overweight people struggle to be thin - partly for legitimate reasons, and partly for this media frenzy. The struggle often drives people to viciously destructive eating disorders and even for the rest creates unfair self-loathing and body image problems. We shouldn't enhance that.
Dennis Hastert's weight, whether choice or biology, has nothing to do with his fitness as Speaker. He's an evil man, yes. He still supports the War in Iraq. He supports torture. He undercuts our Constitution. He protects sexual predators and encourages them to run for Congress. Attack him for that. Don't attack him for an irrelevant physical characteristic shared by tens of millions of Americans.