Across
1. Mail destination, maybe
6. Constrain
11. Blair et al
14. Hungarian Nobel Prize winner Albert ___-Gyorgyi
15. Pleasant Island, now
16. 50 Cent piece?
17. Part one of quip about White House nicknames
19. Loss for Nelson or Dayan
20. Indie rocker DiFranco
21. Its medina dates from A.D. 808
22. Sports
24. Part two of quip
29. Very important
30. Neither optic, tactile, visual, nor gustatory
31. Skiing surname at the 1984 Olympics
34. "___ not mistaken ..."
36. Ma that baas
39. Part three of quip
43. NAFTA signer
44. McKellen and others
45. The American West personified
46. Much, coarsely
49. Song pt.
50. Part four of quip
57. Earthy tone
58. Tar's affirmative
59. Like cheap shots
60. They may be civil: abbr.
61. Part five of quip
66. Abbr. that describes Dennis Hastert in two ways
67. Give a tenth
68. Mock in the schoolyard
69. Acronym meaning "Basque people and homeland"
70. Marxist playwright who penned "Waiting for Lefty"
71. Northern Cross component

Down
1. "Horse hockey!"
2. Allotropic form of element No. 8
3. What a perukemaker may do to you
4. Part of the USN
5. Subaru models introduced in 1985
6. Put six feet under
7. Food that's name means "unleavened"
8. "Oh, ___-leeze!"
9. Abzug cause
10. Kent's nemesis
11. Pick beforehand
12. Fry toppers, in Belgium
13. Threw Euros around
18. Probably not gonna happen
23. They land at Narita International Airport
25. Delicious mallow
26. High school or college freshman, usually
27. Exercises the franking privilege
28. "The Natural History of Religion" philosopher
31. 50 percent of a rebellion
32. Six-pack location
33. Bad Kissingen, notably
34. Chris who sang "Wicked Game"
35. Last word of many films
37. Mexican or Korean
38. Joe of country rock
40. Part of DVD
41. Poor choice from whom to purchase cocaine
42. Boar's gorer
47. "The New Republic" executive editor Christopher
48. Implicates in, as a crime
49. Hotel room feature
50. Beloved name to Yankee fans
51. Singing group, maybe
52. Zillionaire's purchase
53. Butch babes
54. Part of EAP
55. Environmental stress source
56. Future physicist, perhaps
62. Protector of freshness
63. Ending for Wisconsin
64. "___ be better if ..."
65. General who finished No. 2 at West Point in 1829