Sens.-elect Joe Manchin (D-WV) and Chris Coons (D-DE) will be sworn in today at 4:00 pm ET. Both Coons and Manchin were elected to replace appointed senators and so will take office before the start of the 112th Congress.
Meanwhile, Sen.-elect Mark Kirk (R-IL), who won the special election in Illinois, will be sworn in later in November, according to Illinois state law.