Some people choose to run for president without being affiliated with a political party. Such independent candidates need not concern themselves with getting nominated by a party, but must meet other requirements. For example, such candidates are required to collect a large number of signatures to support their nominations. The sources of funding used by independent candidates comes from personal funds and loans as well as fundraising campaigns.
The candidates campaign right up until Election Day, when the nation finally votes for its President. The candidates travel throughout the country, making public appearance and giving speeches. The parties and the candidates use media advertising, direct mailings, telephone campaigns, and other means to persuade the voters to choose one candidate over the other(s). Often, these measures also serve to point out the weaknesses of the candidates from the other parties involved in the general election.
In this national presidential election, every citizen of legal age (who has taken the steps necessary in his/her state to meet the voting requirements, such as registering to vote) has an opportunity to vote. However, the President is not chosen by direct popular vote. The Constitution requires that a process known as the Electoral College ultimately decides who will win the general election.