How does Gallup poll work?

Related questions

1. Who will run 2020?
2. How does a straw poll work?
3. What is the purpose of the poll on a cow?
4. What is a benchmark poll?
5. How are likely voters determined?
6. What are tracking polls?
7. What is the difference between likely voters and registered voters?
8. Do polls use cell phones?
9. Which Democrats are leading in the polls?
10. What's Trump's current approval rating?

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19. #behaviors
20. #population
21. #being
22. #citizens