January 1- Adnan Pachachi becomes president of the Iraq Interim Governing Council and will serve for the duration of the month.
January 1- Samuel Schmid takes office as vice president of Switzerland.
January 4- Texas Congressman Ralph Hall switches to the Republicans. Hall had been a Democrat.
January 4- Mikhail Saakashvili is elected as President of Georgia.
January 6- 2000 Democratic Presidential Candidate Bill Bradley endorses fellow Democrat Howard Dean for President.
January 8- Gavin Newsom is sworn in as Mayor of San Francisco.
January 8- Roosevelt Skerrit is sworn in as Prime Minister of Dominica following the death of Pierre Charles on January 6.
January 12- Kathleen Babineaux Blanco is sworn in as Governor of Louisiana.
January 13- Haley Barbour is sworn in as Governor of Mississippi.
January 13- Howard Dean wins a non-binding primary in Washington, DC with 43% of the vote. Al Sharpton comes in second with 34% of the vote.
January 13- Former Treasury Secretary Paul O'Neill contributes to a book that claims that George W. Bush wanted to attack Iraq since his term began in January 2001 and not after the September 11, 2001 attacks as had been believed.
January 15- Carol Moseley Braun drops out of the 2004 Presidential race and endorses Howard Dean.