In the moments before his weekly radio address hit the airwaves in 1984, Ronald Reagan made an off-the-record joke: "I've signed legislation that will outlaw Russia forever. We begin bombing in five minutes." As reports of the stunt leaked to the press, many Americans did not find themselves laughing along with the president. Long a fervent warrior against what he termed the "Evil Empire," by the mid-1980s, Reagan confronted growing domestic opposition...