What does it mean to caucus for a candidate?

Related questions

1. How many presidents have been impeached?
2. How long has Obama been president?
3. Has an incumbent president ever lost a primary?
4. Could Obama run again?
5. How many incumbent presidents have lost?
6. Can an incumbent president be challenged in a primary?
7. Will Republicans primary Trump in 2020?
8. Has an incumbent president lost reelection?
9. Can a two term president run for vice president?
10. What is the 2020 primary schedule?

Tags

1. #members
2. #canada
3. #zealand
4. #africa
5. #definition
6. #nepal
7. #supporters
8. #exact
9. #caucus
10. #australia
11. #specific
12. #between
13. #cultures
14. #party
15. #political
16. #united
17. #expanded
18. #originated
19. #meeting
20. #states
21. #spread
22. #movement
23. #south