Voters in this year’s presidential election will be some of the most diverse ever, according to the Pew Research Center. By Election Day, nearly one-in-three eligible voters will be Hispanic, black, Asian or any other racial and ethnic minority.

Political director Lisa Desjardins joins Gwen Ifill to break down a few things to watch for in tonight’s caucuses, including key areas for both parties, the kind of voters Democratic candidates are hoping for and an app that streamlines the…