Rudy Giuliani became what was once known as a "Reagan Democrat" in 1980, when he switched his party registration from the consciously ambiguous New York City "Independent" to the bold and rare New York City "Republican." Giuliani remembers his conversion as a response to the inspiring candidacy of Ronald Reagan, who that year overwhelmed the struggling President Jimmy Carter to become the 40th President. Now that Rudy Giuliani is running for the Republican nomination for President ("Yes, I'm running. Sure.") and quoting Ronald Reagan enthusiastically ("The future belongs to the free."), it is compelling to look again at 1980 for...