I'm going to host a MoveOn-inspired/ asssociated event this Saturday. The plan is to meet at my house around 11ish, Saturday 4/23, then canvass the neighborhood handing out signs and flyers that explain the importance of the filibuster.
More information about participating in this action, donating, or writing LTE can be found on the MoveOn website:
MoveOn
Alternatively, you can call Senators Spector or Santorum (much good may it do you) and remind them that 3 Republicans have already come out in favor of preserving the filibuster, and that a majority of Americans favor preserving it.
Contact them in Washington:
Santorum (202) 224-6324
Specter (202) 224-4254
Or in Philadelphia:
Santorum (215) 864-6900
Specter (215) 597-7200
Recommend if you think it will help people see this and sign up to help out!