New poll calls Biden's lead over Trump of "landslide proportions"

A new national poll shows President Trump trailing each of six Democratic candidates in potential head-to-head contests. The Democrats' lead ranges from five points for Cory Booker and Pete Buttigieg to 13 points for Joe Biden. The poll calls Biden's 53 to 40 advantage a landslide proportion. The president and former vice president traded sharp words in Iowa Tuesday. Ed O'Keefe reports.