political editor and correspondent for npr. help us understand what a caucus is and how it differs from a primary, which most states have. yeah, primaries are things most people understand. you walk in, cast a vote. maybe on an electronic ballot or writing something down. then you leave. you go about your business. this is different. it takes more time. a caucus is just basically a gathering, a meeting. people gather in firehouses or libraries, schools, even sometimes in people s houses because these are precinct caucuses that take place at very like local, local community level. so you re talking 1650 sites that republicans are holding these caucuses. they ll have a little party business to attend to, they ll vote on things like who the secretary of the caucus should be, who is going to take notes, and then they essentially just cast a secret ballot writing down who they think should be the nominee. very different than the way democrats do things and it