Cindy Sheehan didn't do anything 'singlehandedly'. This was created, choreographed, written, produced, not to mention paid for by the Leftist hordes.
Ironically, Cindy got this ball rolling when Ted Koppel dissed her.
Cindy's angry, anti-Israel letter to Nightline was posted at her request here last March.
You can see her letter (and part of her email address?) if you scroll down about 1 screen's worth.
If the link doesn't work the first time, try it again.