On November 30, 1804, for the third time in its brief history, the Senate began preparations for an impeachment trial. In 1798 and 1799, the Senate had tried a senator previously expelled on grounds of treason. The Senate dismissed the case, citing lack of jurisdiction. The second impeachment trial, in 1804, removed a federal judge for reasons of drunkenness and insanity. More than the first two proceedings, however, this third trial challenged the Senate to explore the meaning of impeachable crimes.
Samuel Chase had served on the Supreme Court since 1796. A staunch Federalist with a volcanic personality, Chase showed no willingness to tone down his bitter partisan rhetoric after Jeffersonian Republicans gained control of Congress in 1801. Representative John Randolph of Virginia, at the urging of President Thomas Jefferson, orchestrated impeachment proceedings against Chase, declaring he would wipe the floor with the obnoxious justice. The House voted to impeach Chase on March 12, 1804, accusing Chase of refusing to dismiss biased jurors and of excluding or limiting defense witnesses in two politically sensitive cases. The trial managers (members of the House of Representatives) hoped to prove that Chase had "behaved in an arbitrary, oppressive, and unjust way by announcing his legal interpretation on the law of treason before defense counsel had been heard." Highlighting the political nature of this case, the final article of impeachment accused the justice of continually promoting his political agenda on the bench, thereby "tending to prostitute the high judicial character with which he was invested, to the low purpose of an electioneering partizan."
On November 30, 1804, the Senate appointed a committee to "prepare and report proper rules of proceedings" for the impeachment trial. When they took up the case against the Federalist justice in January 1805, the Senate consisted of 25 Jeffersonian Republicans and nine Federalists. Chase appeared before the members on January 4, 1805, to answer the charges. He declared that he was being tried for his political convictions rather than for any real crime or misdemeanor and requested a one-month postponement to prepare a defense. The Senate agreed and the trial began in earnest on February 4.
Chase's defense team, which included several of the nation's most eminent attorneys, convinced several wavering senators that Chase's conduct did not warrant his removal from office. With at least six Jeffersonian Republicans joining the nine Federalists who voted not guilty on each article, the Senate on March 1, 1805, acquitted Samuel Chase on all counts. A majority voted guilty on three of the eight articles, but on each article the vote fell far short of the two-thirds required for conviction. The Senate thereby effectively insulated the judiciary from further congressional attacks based on disapproval of judges’ opinions. Chase resumed his duties at the bench, where he remained until his death in 1811.