Reply #14: Wrong, apparently it's been done

[jobycom]

http://www.factmonster.com/spot/impeach.html

The right to impeach public officials is secured by the U.S. Constitution in Article I, Sections 2 and 3, which discuss the procedure, and in Article II, Section 4, which indicates the grounds for impeachment: "the President, Vice President, and all civil officers of the United States shall be removed from office on impeachment for, and conviction of, treason, bribery, or other high crimes and misdemeanors."

snip

Since 1797 the House of Representatives has impeached sixteen federal officials. These include two presidents, a cabinet member, a senator, a justice of the Supreme Court, and eleven federal judges. Of those, the Senate has convicted and removed seven, all of them judges. Not included in this list are the office holders who have resigned rather than face impeachment, most notably, President Richard M. Nixon.