"There is no news in the truth, and no truth in the news."
"The revolution will not be televised... Instead it will be filmed from multiple angles via cell phone cameras, promptly uploaded to YouTube, Tweeted about, and then shared on Facebook, pending a Wi-Fi connection."
I would use some language like:
Youu will be running for re-election in less than 2 years. If you take an anti-second amendment stance, I will do everything that I can to support your opponents, both in the rpimary and in the general election. That includes fund raising and volunteering.
I will use your letter as a go-by for myself as well.