Here's what I sent:
I am outraged at the latest revelations of domestic spying authorized by President Bush. Congress has given the Executive Branch legal ways of authorizing any investigation on foreign nationals, and any justifiable investigation of American citizens. These include retroactive warrants through the FISA courts.The president, rather than using the extremely broad authority he has been granted, instead ordered warrantless searches and wiretaps. He has admitted, publicly, that there is no authority for them other than that, as president, he said so. He also says he intends to continue these illegal wiretaps.
This goes beyond a policy dispute. These are blatantly illegal acts, and a clear violation of his oath to preserve, protect, and defend the Constitution of the United States. This president must be impeached for his crimes.
If a president can break the law, and get away with it purely because he is president, this is not a democracy, nor a republic: it is a dictatorship. The job of Congress includes protecting us from any president who would attempt to make Congress, the courts, and the American voter irrelevant rubber-stamps.
Feel free to borrow part or all of it, if you're minded to write to your own representatives, or to a newspaper--what I wrote is based in part on a discussion on Making Light.