Politics, as they say, ain't bean bag. And more than that, real political engagement is not and should not be a debating exercise. There's organizing and rough-and-tumble. That's not an unfortunate concession. That's how people with strong beliefs peacefully hash out their differences in a democratic society. But, c'mon, showing up as a mob and shouting people down is showing up as a mob and shouting people down.
Update: Even Michael Steele agrees. Doesn't he? (emphasis mine)
"… I'm not telling people to go out and be disruptive, because there's no upside to doing that. We want to have a legitimate debate…there's no upside for us in starting a fight with the Democratic Party, or with elected officials that we disagree with."