Are presidential portraits public domain?

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Tags

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2. #website
3. #domain
4. #government
5. #often
6. #policy
7. #anyone
8. #protected
9. #white
10. #wikimedia
11. #copyright
12. #licensed
13. #commons
14. #material
15. #according
16. #under
17. #house
18. #usable
19. #public
20. #portraits
21. #therefore
22. #photographs
23. #including
24. #presidential