From Obama To Trump: A Head-Spinning Political Decade

It's been a head-spinning political decade. It started with Barack Obama as president. It ends with President Trump impeached and running for re-election.

Here & Now's Tonya Mosley speaks with Julian Zelizer (@julianzelizer), professor of history and public affairs at Princeton University and a CNN political analyst, about his article with fellow Princeton historian Kevin Kruse in USA Today.