NYT Crossword Puzzle Has Every Answer Pertain to the Rally to Restore Sanity

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Yesterday’s New York Times crossword had a theme that revealed itself as you completed it. That theme? The Rally to Restore Sanity and/or Fear. I’m not a big crossword guy, but does this happen a lot? Does Will Shortz dedicate entire puzzles to, say, the season premieres of his favorite TV shows or a new album by his favorite artist? Or is he such a Daily Show superfan that he broke the rules just this once?