Taylor Swift urges you to vote for the candidates "who represent you the most". The first polls opened in Vermont at 6 a.m.

ET. The last ones close in Alaska at midnight (Eastern time) Super Tuesday is the most important day of the presidential primary elections. It decides 865 Republican delegates in 15 states and 1,420 Democratic delegates in15 states and the territory of Samoa. The president, Joe Biden, had 206 delegates before Tuesday and has no major rival, so this election measures his strength against the protest vote.