At 74 the Vietnam veteran who became an anti-war protester, senator and secretary of state continues, as he says, to “invest in citizenship.” “Face the Nation” host Margaret Brennan interviews John Kerry, who has penned a new memoir, “Every Day Is Extra,” and who talks about the current political climate, the need for Democrats to regain political control, and his plans for 2020. (For part two of Brennan’s interview tune in to “Face the Nation” on September 2.)