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Poll says Biden's lead over Trump a landslide...

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.
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