1858   The first of seven highly publicized debates are held between Abraham Lincoln and Stephen A. Douglas during their campaign for an open seat in the United States Senate for the state of Illinois

1858   Stephen A. Douglas defeats Abraham Lincoln in an election for a United States Senate seat from the state of Illinois. The highly publicized election propels Abraham Lincoln to national prominence.

1991   After an extensive debate over the allegations of sexual misconduct, the United States Senate senate votes 52-48 to confirm the appointment of Judge Clarence Thomas to the Supreme Court of the United States.

1998   The United States Senate passes Resolution 71, urging Bill Clinton to "take all necessary and appropriate actions to respond to the threat posed by Iraq's refusal to end its weapons of mass destruction programs."

1999   U.S. President]] Bill Clinton is acquitted by of perjury and obstruction of justice charges after impeachment proceedings in the United States Senate.

2004   The Republican Party gains 4 seats in the United States Senate and 4 seats in the United States House of Representatives in congressional elections in the United States