Why is it called pork barrel?

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Tags

1. #votes
2. #constituents
3. #spending
4. #refers
5. #storing
6. #their
7. #politics
8. #intended
9. #history
10. #barrel
11. #campaign
12. #benefit
13. #return
14. #contributions
15. #either
16. #which
17. #support
18. #etymology
19. #usually
20. #originally
21. #political
22. #politician