The document provides an overview of the US presidential election process, which can be divided into 5 stages:
1) The "invisible primary" where potential candidates attempt to gain credibility and support before the official primary season.
2) The primaries and caucuses where each state selects delegates to support candidates at national conventions.
3) The national conventions where the major parties select their presidential nominee and vice presidential candidate.
4) The general election campaign where the nominees attempt to persuade voters.
5) Election Day in November and the Electoral College process to formally elect the president.