http://en.wikipedia.org/wiki/List_of_Un ... r_censured

List of United States senators expelled or censured
From Wikipedia, the free encyclopedia
The United States Constitution gives the Senate the power to expel any member by a two-thirds vote. This is separate from the Impeachment power the Senate has over other federal officials. The Supreme Court determined in 1797 that Senators could not be impeached, but only expelled.
Expulsion is an extremely rare event. It has not actually occurred since the Civil War, although this is partly because many members resign rather than face a formal proceeding when expulsion appears possible. Censure, a lesser punishment which represents a formal statement of disapproval, has been more common in the last century. Although censure carries no formal punishment, only one Senator (Benjamin R. Tillman) of the nine to be censured has ever been re-elected.

http://en.wikipedia.org/wiki/Censure
Censure in the United States

Main article: Censure in the United States
Censure is a congressional procedure for publicly reprimanding the President of the United States, a member of Congress or a judge for inappropriate behavior. When the president is censured, it serves merely as a condemnation and has no direct effect on the validity of presidency, nor are there any other particular legal consequences. Unlike impeachment, censure has no basis in the Constitution, or in the rules of the Senate and House of Representatives. It derives from the formal condemnation of either congressional body of their own members.
To date Andrew Jackson is the only sitting president to be successfully censured, and his censure was subsequently expunged from the record.[1]
On December 2, 1954, Senator Joseph McCarthy (R-WI) was censured by the United States Senate for behavior that was “contrary to senatorial traditions." McCarthy had recklessly accused employees of the U.S. government of membership in the communist party, or of communist sympathies. McCarthy's efforts did not result in any convictions or criminal prosecutions for espionage. However, intercepted Soviet communications from the now-declassified VENONA project, as well as the opening of Soviet Archives, indicate that some of the individuals he pursued were, in fact, Soviet spies.
On June 10, 1980, Rep. Charles H. Wilson (D-CA) was censured by the House of Representatives for "financial misconduct," as a result of the "Koreagate" scandal of 1976. Koreagate was an American political scandal involving South Koreans seeking influence with members of Congress. An immediate goal seems to have been reversing President Richard Nixon's decision to withdraw troops from South Korea. It involved the KCIA (now National Intelligence Service (South Korea)) funnelling bribes and favors through Korean businessman Tongsun Park in an attempt to gain favor and influence. Some 115 members of Congress were implicated. Also investigated were Sun Myung Moon and his Unification Church.
On March 13, 2006, Senator Russ Feingold (D-WI) introduced a resolution in the U.S. Senate for a censure of President George W. Bush. This was a result of allegations of illegal wiretapping, as reported in the New York Times, that the President did not follow the Foreign Intelligence Surveillance Act of 1978 (FISA), which mandates use of a surveillance court for approval of wiretaps on Americans. In its history the court has granted almost every requested warrant, and in only exceedingly rare instances has it turned down a request. The U.S. Senate has not yet voted on the resolution, as it first needs to be considered by the Senate Judiciary Committee. Then, it may or may not be sent to the floor of the U.S. Senate for a vote.