Only on the "CBS This Morning" podcast, CBS News political contributors Robby Mook and Terry Sullivan discuss the 2020 presidential race with less than 50 days until the Iowa caucuses. Talking with CBS News political correspondent Ed O'Keefe, Sullivan, Senator Marco Rubio's former 2016 campaign manager, shares how candidates can stand out in a crowded field and on a crowded debate stage. Mook, Hillary Clinton's campaign manager from 2016, discusses how Democrats can compete against President Donald Trump and the Republican Party's growing campaign war chest.