Hey,
A republican group "move america forward" has sent out many emails to thousands of people for people to write and tell these theaters to not show Farenheit911. Three theaters have already cancelled. Fortunately, this site has the emails of all the theaters, so people can email the theaters to not show it.
http://www.moveamericaforward.org/MichaelMoore/
Email the theaters, and thank them for showing this movie. Send this to whoever you can. Comment in the thread of how many theaters you emailed.
THANKS!