By HILLEL ITALIE
AP National Writer
NEW YORK (AP) — Oprah Winfrey, David Letterman and Ellen DeGeneres are among the celebrity moderators joining former first lady Michelle Obama on tour for her upcoming book, “The Light We Carry: Overcoming in Uncertain Times.” Other guests include Gayle King, Conan O’Brien, Tracee Ellis Ross, Michele Norris, Elizabeth Alexander and Heather McGhee. On Wednesday, Crown and Live Nation also announced that Obama has added seven stops to her monthlong tour, which begins at Washington’s Warner Theatre on Nov. 15, the book’s publication date. Additional appearances have been scheduled in Washington, Chicago, Philadelphia, Atlanta, Chicago and San Francisco.