That's true, but there's more to it than that. They want George Bush impeached more than anything else in the world. They want it both as payback for Clinton's impeachment, and to completely discredit the War on Terror and all our policies since 9/11.
Everything else they've tried to bring about Bush's impeachment (tying him to Enron, claiming that he knew about the 9/11 attacks and did nothing, claiming that he masterminded the 9/11 attacks so he could have an excuse to go to war, the Downing Street Memos, feel free to add any others I've missed) has failed miserably because there's nothing there, and their allies in the press no longer have the power to make something out of nothing. So this is just the next manufactured scandal to come down the pipe. Once it fails to generate a huge public demand for impeachment, they'll move on to something else.
The RATS just don't get it because they're blinded by hate and their quest for power. They need to stop declaring war on the Bush Administration and declare war on terrorism.