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There was a thread last year from someone who worked in the office of a congressperson, and while they get texts and faxes, they stated that calls are more effective because phones going nuts is perceived as better. I'll see if I can find it for you.
With you guys allll the way! Impressed with your leadership! Do NOT be deterred! 
Yes Shelia tell them to let them know no excuse for violence
Learn how to spell.
I may just keep calling and hanging up to tie up the lines. Go away!!
TELL THEM THERE NO EXCUSE FOR VIOLENCE
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