Campbell Spencer, a lesbian and political consultant, moved to Washington in the 1990s to work in LGBTQ advocacy. She wooed gay and lesbian voters for Al Gore, worked a stint in the Obama White House and now serves on the board of the LGBTQ Victory Fund, which this year issued its first-ever endorsement of a presidential candidate: Pete Buttigieg. But so far, Kamala Harris has wowed Spencer more than any other candidate in the race. “Mayor Pete, he’s a trailblazer,” Spencer said in an interview. “But I’m one of these women who thinks we are way overdue for having a...