How Do the Iowa Democratic Caucuses Work?

Once every four years, Iowa seizes the national political spotlight with its caucus vote - the first nominating contest for candidates seeking their party's nomination. Party activists head out to local schools and other locations to express their preference for the various Democratic and Republican candidates running for president. The process can take hours, and the results are eventually used to award convention delegates to candidates who do well.

Here's a look at how the Iowa Democratic Caucuses work.  Click the arrows to move forward and back through the process.