A presidential campaign is actually a series of statewide races for what is known as the "electoral vote." Each state is given electoral votes equal to its total number of House and Senate members. All of a state's electoral votes go to the statewide winner of the presidential race. A total of 270 electoral votes is needed for a presidential candidate to win the nomination.

Choose one of the selections at the right to see the latest CNN electoral vote analysis. This feature will be updated regularly until Election Day.