The election process begins with primary elections and caucuses. These are two methods that states use to select a potential presidential nominee. In general, primaries use secret ballots for voting. Caucuses are local gatherings of voters who vote at the end of the meeting for a particular candidate. Then it moves to nominating conventions, during which political parties each select a nominee to unite behind. During a political party convention, each presidential nominee also announces a vice presidential running mate. The candidates then campaign across the country to explain their views and plans to voters. They may also participate in debates with candidates from other parties.