History of Federal Impeachment Proceedings in the United States
Congress regards impeachment as a power to be used only in extreme cases; the House has initiated impeachment proceedings only 64 times since 1789 (most recently against Judge Thomas Porteous of the United States District Court for the Eastern District of Louisiana) with only the following 19 of these proceedings actually resulting in the House passing Articles of Impeachment:
Two presidents:
Andrew Johnson, Democrat/National Union, was impeached in 1868 after violating the then-newly created Tenure of Office Act. President Johnson was acquitted by the Senate, falling one vote short of the necessary 2/3 needed to remove him from office, voting 35-19 to remove him. The Tenure of Office Act would later be found unconstitutional by the Supreme Court of the United States in dicta.
Bill Clinton, Democrat, was impeached on December 19, 1998, by the House of Representatives on articles charging perjury (specifically, lying to a federal grand jury) by a 228–206 vote, and obstruction of justice by a 221–212 vote. The House rejected other articles: One was a count of perjury in a civil deposition in Paula Jones' sexual harassment lawsuit against Clinton (by a 205–229 vote). The second article was one that accused Clinton of abuse of power by a 48–285 vote. President Clinton was acquitted by the Senate on February 12, 1999. The Senate vote fell short of the necessary 2/3 needed to remove him from office, voting 45-55 to remove him on obstruction of justice and 50-50 on perjury.
One cabinet officer, William W. Belknap (former Secretary of War), resigned before his trial, and was later acquitted. Allegedly most of those who voted to acquit him believed that his resignation had removed their jurisdiction.
One Senator, William Blount, in 1797. He was expelled by the Senate, which declined to try the impeachment.
One Justice of the Supreme Court of the United States, Samuel Chase in 1804. He was acquitted by the Senate.
Fourteen other federal judges. Seven of these have been convicted by the Senate and removed [10], including Alcee Hastings, who was impeached and convicted for taking over $150,000 in bribe money in exchange for sentencing leniency. The Senate did not bar Hastings from holding future office, and Hastings won election to the House of Representatives from Florida. Hastings' name was mentioned as a possible Chairman of the House Permanent Select Committee on Intelligence, but was passed over by House Speaker-designate Nancy Pelosi, presumably because of his previous impeachment and removal. Source U.S. Senate
Richard Nixon, Republican, was never impeached. While the House Judiciary Committee did approve articles of impeachment against him and did report those articles to the House of Representatives, Nixon resigned before the House could consider the impeachment resolutions and was subsequently pardoned by President Ford.