Former Vice President Kamala Harris revealed that Pete Buttigieg was her “first choice” as running mate in last year’s presidential election, but such a pairing “was too big of a risk,” according to an excerpt from her upcoming book. Buttigieg, the former secretary of transportation and mayor of South Bend, Indiana, who is gay, “would have been an ideal partner — if I were a straight white man,” Harris wrote in a portion of “107 Days” published by The Atlantic. “But we were already asking a lot of America: to accept a woman, a black woman, a black woman married...