This can and should be used against them.
“On the eve of the August recess, members are reporting meetings that have gone terribly awry, marked by angry, sign-carrying mobs and disruptive behavior. In at least one case, a congressman has stopped holding town hall events because the situation has spiraled so far out of control.”
Hope and change! But if you cancel the town halls, the angry constituents will still find you somewhere, won’t they?
And Operation Embarrass Your Congressman has more on what you can do.