Articles Referenced: 

https://www.thenation.com/article/politics/iowa-caucus-democrats/?fbclid=IwAR1xUUmw9XmZ3ovjqunHOnSbKA_yaasIN-3lQ0INvYYQ77z_gyLgJCmmSAs

https://thehill.com/homenews/campaign/483161-bidens-lead-shrinks-in-south-carolina-as-sanders-climbs-to-second-poll