Play of the Day: More than Just a Weekend at Bernie's

Hillary Clinton finally has an official challenger for the 2016 Democratic nomination.

President Barack Obama visited a library in DC Thursday, telling children at the event that he is a big fan of renowned children's author Dr. Seuss. Late Night's Seth Meyers suggested Thursday that Obama likes Seuss' book for an odd reason: To help put Joe Biden to bed.

Vermont's Bernie Sanders entered the 2016 race this week, providing Hillary Clinton with her only official challenger in her party. The Daily Show's Jon Stewart joked about Sanders' lack of name recognition, while The Late Show mocked Sanders' large hand gestures during speeches and The Tonight Show tested out some Sanders campaign slogans.

Be sure to check out Stewart enumerating the differences between Sanders and Clinton at 2:15.