Senate historian emeritus Don Ritchie on Biden's inauguration
President Joe Biden takes office with a trifecta for his party, with Democrats earning a majority in both the Senate and the House. He comes to the role after 36 years in the Senate and eight years as vice president. Don Ritchie, the historian emeritus of the Senate, joins CBSN to put in historical context the role Mr. Biden and Vice President Kamala Harris now fill.