In this weekend's episode, three segments from this past week's Washington Journal. First, President Trump marked his 100th day in office earlier this week – but ever wonder where that benchmark came from? We'll find out with presidential historian Lindsay Chervinsky. Then, Cook Political Report's David Wasserman discusses his analysis of the electorate and shifts in political polarization. It's actually getting better . Finally, a brand new poll shows young Americans losing faith in government institutions and in leaders of BOTH parties. We'll dig into the results with Jordan Schwartz - student chair of the Harvard Youth Poll.

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