Super Tuesday refers to a Tuesday early in the US presidential primary season when the greatest number of states hold their elections on the same day. More delegates can be won on Super Tuesday than any other single day of the primary calendar. Candidates seeking the presidency traditionally must do well on this day to secure their party’s nomination.
The particular states holding primaries on Super Tuesday vary from year to year since each state decides separately. Some years have more than one Super Tuesday (2008) but the day is important because the states included are usually from geographically and socially diverse regions of the country so they represent the presidential candidates first test of NATIONAL electability.