Ahead of each U.S. general election, the two main political parties, Democrats and Republicans, select one individual each to compete for the Oval office. They do that through two systems: primary elections and caucuses. Here’s what you need to know about how the process works ahead of the Iowa caucuses.
- Iowa caucuses: Here’s why Iowa goes first and why it matters
- How are U.S. presidential nominees selected? A look at primaries and caucuses