Michelle Obama says it was a “slap in the face’’ that minorities didn’t go to the polls in 2016 — and has no plans on re-entering the political spotlight amid a push to make her Joe Biden’s running mate. “It takes some energy to go high, and we were exhausted from it … when you’re the first black anything,’’ she said of her and her husband, former President Barack Obama, in a new Netflix documentary set to air Wednesday, May 6. “You know, the day I left the White House, it was painful to sit on that stage, and then...