We have hit the 100th day of Joe Biden’s presidency. It has become part of the political fabric to examine a presidency after 100 days -- but why? Where did this sort of arbitrary benchmark come from? And as long as we're here, what have we learned 100 days into the Presidency of Joe Biden? Dr. Ben Berger, Associate Professor of Political Science at Swarthmore College and Executive Director of the Lang Center for Civic and Social Responsibility joins KYW Newsradio In Depth to talk about why the first 100 days matter so much and how Biden's stack up to the rest.

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