IN this summer of town hall disruptions and birth-certificate controversies, a summer when it seemed as if the Republican Party had been captured by its extremist wing, it is worth recalling a now-obscure letter from President Dwight D. Eisenhower.

Although Eisenhower is commonly remembered for a farewell address that raised concerns about the “military-industrial complex,” his letter offers an equally important  and relevant  warning: to beware the danger posed by those seeking freedom from the “mental stress and burden” of democracy.

The story began in 1958, when Eisenhower received a letter from Robert Biggs, a terminally ill World War II veteran. Biggs told the president that he “felt from your recent speeches the feeling of hedging and a little uncertainty.” He added, “We wait for someone to speak for us and back him completely if the statement is made in truth.”

Eisenhower could have discarded Biggs’s note or sent a canned response. But he didn’t. He composed a thoughtful reply. After enduring Senator Joseph McCarthy of Wisconsin, who had smeared his old colleague Gen. George C. Marshall as a Communist sympathizer, and having guarded the Republican Party against the newly emergent radical right John Birch Society, which labeled him and much of his cabinet Soviet agents, the president perhaps welcomed the opportunity to expound on his vision of the open society.