Iowa caucuses: Democratic caucus won by Barack Obama, Republican caucus won by Mike Huckabee., Chris Dodd and Joe Biden drop out of the Democratic race.
Obama wins Lousiana Democratic primary, Republican primary ends with Hucabee only slightly ahead of McCain.
The original Super Tuesday: Sen. Hillary Clinton wins in Rhode Island, Ohio and Texas (primary); Sen. Barack Obama wins Vermont and Texas (caucus)
President Bush endorses McCain.
Pennsylvania Democratic Primary won by Hillary Clinton and Pennsylvania Republican Primary won by John McCain.
North Carolina Democratic Primary, won by Obama; North Carolina Republican Primary won by McCain; Indiana Democratic Primary narrowly won by Clinton; and Indiana Republican Primary won by McCain
Supporters in Congress tell Clinton race is over in conference call.
Obama makes trip to Europe and the Middle East.
Barack Obama is officially nominated for President by the Democratic Party. He becomes the first African-American in U.S. history to receive the presidential nomination of a major party.
Alaska Governor Sarah Palin is selected by McCain as his choice for the Republican vice-presidential candidate.
Sarah Palin is offically nominated for Vice-President by the Republican Party.
Vice Presidential Debate at Washington University in St. Louis between Joe Biden and Sarah Palin
November 4: Election Day
December 15 - Electoral College casts official votes for President and Vice-President; each state's electors meet in their respective state capitals.