Susan Sarandon, Olivia Wilde and Edward Norton are among the more than 90 entertainers urging Sen. Elizabeth Warren to throw her hat in the 2016 presidential race. The group — which also includes Mark Ruffalo, Natasha Lyonne, Julia Stiles, and “The Avengers” director Joss Whedon — penned an open letter this week to the Massachusetts Democrat, pushing her to make a White House bid.