- Last week, Khizr Khan, a Harvard-trained Gold Star father, said that Donald Trump did not understand the meaning of true sacrifice.
- Charles Kaiser: At a pivotal moment in American history, Khan's comment may be the reason it also becomes a righteous one.
Charles Kaiser is the author of "1968 in America," "The Gay Metropolis" and, most recently, "The Cost of Courage." The opinions expressed in this commentary are his.
(CNN)Sixty-two years ago, Joseph Welch interrupted Wisconsin Sen. Joe McCarthy when he was in the middle of smearing Fred Fisher, a lawyer in Welch's office. Welch stopped the communist-hunting McCarthy in his tracks on national television.