Refers to a critical date in the campaign calendar - usually in early March - when a large number of states hold primary elections.

The hope was that by holding their votes on the same day, states would increase their influence and downplay the importance of other primaries.

The idea that Super Tuesday would be the decisive event in the primary season was disproved in the 2008 election cycle, when Senator Hillary Clinton failed to break through despite victories in some big states on that date.