NEW YORK — Michelle Obama’s “Becoming” is selling at a pace rarely seen for a political memoir, or any nonfiction book.

Combined hardcover, e-book and audio sales in the U.S. and Canada topped 2 million copies in the first 15 days, Crown Publishing announced Friday.

By comparison, former first lady Hillary Rodham Clinton’s memoir “Living History” needed a month to sell 1 million copies. Former President George W. Bush’s “Decision Points” took several weeks to reach 2 million.