This CNN documentary special looks back at the last time the United States held an impeachment trial in the U,S. Senate against a sitting President. It was 1998, when the House voted to impeach Bill Clinton, and the Senate held a trial in which the majority party, then the Democrats, voted in unity not to impeach. The obvious and potential parallels are familiar, and so are some of the players. Hey, look – over in the House, voting for impeachment, there’s Lindsay Graham! And also in